Payload Format

Currently, the Firefox Health Report is submitted as a compressed JSON document. The root JSON element is an object. A version field defines the version of the payload which in turn defines the expected contents the object.

As of 2013-07-03, desktop submits Version 2, and Firefox for Android submits Version 3 payloads.

Version 3

Version 3 is a complete rebuild of the document format. Events are tracked in an “environment”. Environments are computed from a large swath of local data (e.g., add-ons, CPU count, versions), and a new environment comes into being when one of its attributes changes.

Client documents, then, will include descriptions of many environments, and measurements will be attributed to one particular environment.

A map of environments is present at the top level of the document, with the current named “current” in the map. Each environment has a hash identifier and a set of attributes. The current environment is completely described, and has its hash present in a “hash” attribute. All other environments are represented as a tree diff from the current environment, with their hash as the key in the “environments” object.

A removed add-on has the value ‘null’.

There is no “last” data at present.

Daily data is hierarchical: by day, then by environment, and then by measurement, and is present in “data”, just as in v2.

Leading by example:

{
  "lastPingDate": "2013-06-29",
  "thisPingDate": "2013-07-03",
  "version": 3,
  "environments": {
    "current": {
      "org.mozilla.sysinfo.sysinfo": {
        "memoryMB": 1567,
        "cpuCount": 4,
        "architecture": "armeabi-v7a",
        "_v": 1,
        "version": "4.1.2",
        "name": "Android"
      },
      "org.mozilla.profile.age": {
        "_v": 1,
        "profileCreation": 15827
      },
      "org.mozilla.addons.active": {
        "QuitNow@TWiGSoftware.com": {
          "appDisabled": false,
          "userDisabled": false,
          "scope": 1,
          "updateDay": 15885,
          "foreignInstall": false,
          "hasBinaryComponents": false,
          "blocklistState": 0,
          "type": "extension",
          "installDay": 15885,
          "version": "1.18.02"
        },
        "{dbbf9331-b713-6eda-1006-205efead09dc}": {
          "appDisabled": false,
          "userDisabled": "askToActivate",
          "scope": 8,
          "updateDay": 15779,
          "foreignInstall": true,
          "blocklistState": 0,
          "type": "plugin",
          "installDay": 15779,
          "version": "11.1 r115"
        },
        "desktopbydefault@bnicholson.mozilla.org": {
          "appDisabled": false,
          "userDisabled": true,
          "scope": 1,
          "updateDay": 15870,
          "foreignInstall": false,
          "hasBinaryComponents": false,
          "blocklistState": 0,
          "type": "extension",
          "installDay": 15870,
          "version": "1.1"
        },
        "{6e092a7f-ba58-4abb-88c1-1a4e50b217e4}": {
          "appDisabled": false,
          "userDisabled": false,
          "scope": 1,
          "updateDay": 15828,
          "foreignInstall": false,
          "hasBinaryComponents": false,
          "blocklistState": 0,
          "type": "extension",
          "installDay": 15828,
          "version": "1.1.0"
        },
        "{46551EC9-40F0-4e47-8E18-8E5CF550CFB8}": {
          "appDisabled": false,
          "userDisabled": true,
          "scope": 1,
          "updateDay": 15879,
          "foreignInstall": false,
          "hasBinaryComponents": false,
          "blocklistState": 0,
          "type": "extension",
          "installDay": 15879,
          "version": "1.3.2"
        },
        "_v": 1
      },
      "org.mozilla.appInfo.appinfo": {
        "_v": 3,
        "appLocale": "en_us",
        "osLocale": "en_us",
        "distribution": "",
        "acceptLangIsUserSet": 0,
        "isTelemetryEnabled": 1,
        "isBlocklistEnabled": 1
      },
      "geckoAppInfo": {
        "updateChannel": "nightly",
        "id": "{aa3c5121-dab2-40e2-81ca-7ea25febc110}",
        "os": "Android",
        "platformBuildID": "20130703031323",
        "platformVersion": "25.0a1",
        "vendor": "Mozilla",
        "name": "fennec",
        "xpcomabi": "arm-eabi-gcc3",
        "appBuildID": "20130703031323",
        "_v": 1,
        "version": "25.0a1"
      },
      "hash": "tB4Pnnep9yTxnMDymc3dAB2RRB0=",
      "org.mozilla.addons.counts": {
        "extension": 4,
        "plugin": 1,
        "_v": 1,
        "theme": 0
      }
    },
    "k2O3hlreMeS7L1qtxeMsYWxgWWQ=": {
      "geckoAppInfo": {
        "platformBuildID": "20130630031138",
        "appBuildID": "20130630031138",
        "_v": 1
      },
      "org.mozilla.appInfo.appinfo": {
        "_v": 2,
      }
    },
    "1+KN9TutMpzdl4TJEl+aCxK+xcw=": {
      "geckoAppInfo": {
        "platformBuildID": "20130626031100",
        "appBuildID": "20130626031100",
        "_v": 1
      },
      "org.mozilla.addons.active": {
        "QuitNow@TWiGSoftware.com": null,
        "{dbbf9331-b713-6eda-1006-205efead09dc}": null,
        "desktopbydefault@bnicholson.mozilla.org": null,
        "{6e092a7f-ba58-4abb-88c1-1a4e50b217e4}": null,
        "{46551EC9-40F0-4e47-8E18-8E5CF550CFB8}": null,
        "_v": 1
      },
      "org.mozilla.addons.counts": {
        "extension": 0,
        "plugin": 0,
        "_v": 1
      }
    }
  },
  "data": {
    "last": {},
    "days": {
      "2013-07-03": {
        "tB4Pnnep9yTxnMDymc3dAB2RRB0=": {
          "org.mozilla.appSessions": {
            "normal": [
              {
                "r": "P",
                "d": 2,
                "sj": 653
              },
              {
                "r": "P",
                "d": 22
              },
              {
                "r": "P",
                "d": 5
              },
              {
                "r": "P",
                "d": 0
              },
              {
                "r": "P",
                "sg": 3560,
                "d": 171,
                "sj": 518
              },
              {
                "r": "P",
                "d": 16
              },
              {
                "r": "P",
                "d": 1079
              }
            ],
            "_v": "4"
          }
        },
        "k2O3hlreMeS7L1qtxeMsYWxgWWQ=": {
          "org.mozilla.appSessions": {
            "normal": [
              {
                "r": "P",
                "d": 27
              },
              {
                "r": "P",
                "d": 19
              },
              {
                "r": "P",
                "d": 55
              }
            ],
            "_v": "4"
          },
          "org.mozilla.searches.counts": {
            "bartext": {
              "google": 1
            },
            "_v": "4"
          },
          "org.mozilla.experiment": {
            "lastActive": "some.experiment.id"
            "_v": "1"
          }
        }
      }
    }
  }
}

App sessions in Version 3

Sessions are divided into “normal” and “abnormal”. Session objects are stored as discrete JSON:

"org.mozilla.appSessions": {
  _v: 4,
  "normal": [
    {"r":"P", "d": 123},
  ],
  "abnormal": [
    {"r":"A", "oom": true, "stopped": false}
  ]
}

Keys are:

“r”
reason. Values are “P” (activity paused), “A” (abnormal termination).
“d”
duration. Value in seconds.
“sg”
Gecko startup time (msec). Present if this is a clean launch. This corresponds to the telemetry timer FENNEC_STARTUP_TIME_GECKOREADY.
“sj”
Java activity init time (msec). Present if this is a clean launch. This corresponds to the telemetry timer FENNEC_STARTUP_TIME_JAVAUI, and includes initialization tasks beyond initial onWindowFocusChanged.

Abnormal terminations will be missing a duration and will feature these keys:

“oom”
was the session killed by an OOM exception?
“stopped”
was the session stopped gently?

Version 3.2

As of Firefox 35, the search counts measurement is now bumped to v6, including the activity location for the search activity.

Version 3.1

As of Firefox 27, appinfo is now bumped to v3, including osLocale, appLocale (currently always the same as osLocale), distribution (a string containing the distribution ID and version, separated by a colon), and acceptLangIsUserSet, an integer-boolean that describes whether the user set an intl.accept_languages preference.

The search counts measurement is now at version 5, which indicates that non-partner searches are recorded. You’ll see identifiers like “other-Foo Bar” rather than “other”.

Version 3.2

In Firefox 32, Firefox for Android includes a device configuration section in the environment description:

"org.mozilla.device.config": {
  "hasHardwareKeyboard": false,
  "screenXInMM": 58,
  "screenLayout": 2,
  "uiType": "default",
  "screenYInMM": 103,
  "_v": 1,
  "uiMode": 1
}

Of these, the only keys that need explanation are:

uiType
One of “default”, “smalltablet”, “largetablet”.
uiMode
A mask of the Android Configuration.uiMode value, e.g., UI_MODE_TYPE_CAR.
screenLayout
A mask of the Android Configuration.screenLayout value. One of the SCREENLAYOUT_SIZE_ constants.

Note that screen dimensions can be incorrect due to device inaccuracies and platform limitations.

Other notable differences from Version 2

  • There is no default browser indicator on Android.
  • Add-ons include a blocklistState attribute, as returned by AddonManager.
  • Searches are now version 4, and are hierarchical: how the search was started (bartext, barkeyword, barsuggest), and then counts per provider.

Version 2

Version 2 is the same as version 1 with the exception that it has an additional top-level field, geckoAppInfo, which contains basic application info.

geckoAppInfo

This field is an object that is a simple map of string keys and values describing basic application metadata. It is very similar to the appinfo measurement in the last section. The difference is this field is almost certainly guaranteed to exist whereas the one in the data part of the payload may be omitted in certain scenarios (such as catastrophic client error).

Its keys are as follows:

appBuildID
The build ID/date of the application. e.g. “20130314113542”.
version
The value of nsXREAppData.version. This is the application’s version. e.g. “21.0.0”.
vendor
The value of nsXREAppData.vendor. Can be empty an empty string. For official Mozilla builds, this will be “Mozilla”.
name
The value of nsXREAppData.name. For official Firefox builds, this will be “Firefox”.
id
The value of nsXREAppData.ID.
platformVersion
The version of the Gecko platform (as opposed to the app version). For Firefox, this is almost certainly equivalent to the version field.
platformBuildID
The build ID/date of the Gecko platfor (as opposed to the app version). This is commonly equivalent to appBuildID.
os
The name of the operating system the application is running on.
xpcomabi
The binary architecture of the build.
updateChannel
The name of the channel used for application updates. Official Mozilla builds have one of the values {release, beta, aurora, nightly}. Local and test builds have default as the channel.

Version 1

Top-level Properties

The main JSON object contains the following properties:

lastPingDate
UTC date of the last upload. If this is the first upload from this client, this will not be present.
thisPingDate
UTC date when this payload was constructed.
version
Integer version of this payload format. Currently only 1 is defined.
clientID

An identifier that identifies the client that is submitting data.

This property may not be present in older clients.

See Identifiers for more info on identifiers.

clientIDVersion

Integer version associated with the generation semantics for the clientID.

If the value is 1, clientID is a randomly-generated UUID.

This property may not be present in older clients.

data
Object holding data constituting health report.

Data Properties

The bulk of the health report is contained within the data object. This object has the following keys:

days
Object mapping UTC days to measurements from that day. Keys are in the YYYY-MM-DD format. e.g. “2013-03-14”
last
Object mapping measurement names to their values.

The value of days and last are objects mapping measurement names to that measurement’s values. The values are always objects. Each object contains a _v property. This property defines the version of this measurement. Additional non-underscore-prefixed properties are defined by the measurement itself (see sections below).

Example

Here is an example JSON document for version 1:

{
  "version": 1,
  "thisPingDate": "2013-03-11",
  "lastPingDate": "2013-03-10",
  "data": {
    "last": {
      "org.mozilla.addons.active": {
        "masspasswordreset@johnathan.nightingale": {
          "userDisabled": false,
          "appDisabled": false,
          "version": "1.05",
          "type": "extension",
          "scope": 1,
          "foreignInstall": false,
          "hasBinaryComponents": false,
          "installDay": 14973,
          "updateDay": 15317
        },
        "places-maintenance@bonardo.net": {
          "userDisabled": false,
          "appDisabled": false,
          "version": "1.3",
          "type": "extension",
          "scope": 1,
          "foreignInstall": false,
          "hasBinaryComponents": false,
          "installDay": 15268,
          "updateDay": 15379
        },
        "_v": 1
      },
      "org.mozilla.appInfo.appinfo": {
        "_v": 1,
        "appBuildID": "20130309030841",
        "distributionID": "",
        "distributionVersion": "",
        "hotfixVersion": "",
        "id": "{ec8030f7-c20a-464f-9b0e-13a3a9e97384}",
        "locale": "en-US",
        "name": "Firefox",
        "os": "Darwin",
        "platformBuildID": "20130309030841",
        "platformVersion": "22.0a1",
        "updateChannel": "nightly",
        "vendor": "Mozilla",
        "version": "22.0a1",
        "xpcomabi": "x86_64-gcc3"
      },
      "org.mozilla.profile.age": {
        "_v": 1,
        "profileCreation": 12444
      },
      "org.mozilla.appSessions.current": {
        "_v": 3,
        "startDay": 15773,
        "activeTicks": 522,
        "totalTime": 70858,
        "main": 1245,
        "firstPaint": 2695,
        "sessionRestored": 3436
      },
      "org.mozilla.sysinfo.sysinfo": {
        "_v": 1,
        "cpuCount": 8,
        "memoryMB": 16384,
        "architecture": "x86-64",
        "name": "Darwin",
        "version": "12.2.1"
      }
    },
    "days": {
      "2013-03-11": {
        "org.mozilla.addons.counts": {
          "_v": 1,
          "extension": 15,
          "plugin": 12,
          "theme": 1
        },
        "org.mozilla.places.places": {
          "_v": 1,
          "bookmarks": 757,
          "pages": 104858
        },
        "org.mozilla.appInfo.appinfo": {
          "_v": 1,
          "isDefaultBrowser": 1
        }
      },
      "2013-03-10": {
        "org.mozilla.addons.counts": {
          "_v": 1,
          "extension": 15,
          "plugin": 12,
          "theme": 1
        },
        "org.mozilla.places.places": {
          "_v": 1,
          "bookmarks": 757,
          "pages": 104857
        },
        "org.mozilla.searches.counts": {
          "_v": 1,
          "google.urlbar": 4
        },
        "org.mozilla.appInfo.appinfo": {
          "_v": 1,
          "isDefaultBrowser": 1
        }
      }
    }
  }
}

Measurements

The bulk of payloads consists of measurement data. An individual measurement is merely a collection of related values e.g. statistics about the Places database or system information.

Each measurement has an integer version number attached. When the fields in a measurement or the semantics of data within that measurement change, the version number is incremented.

All measurements are defined alphabetically in the sections below.

org.mozilla.addons.addons

This measurement contains information about the currently-installed add-ons.

Version 2

This version adds the human-readable fields name and description, both coming directly from the Addon instance as most properties in version 1. Also, all plugin details are now in org.mozilla.addons.plugins.

Version 1

The measurement object is a mapping of add-on IDs to objects containing add-on metadata.

Each add-on contains the following properties:

  • userDisabled
  • appDisabled
  • version
  • type
  • scope
  • foreignInstall
  • hasBinaryComponents
  • installDay
  • updateDay

With the exception of installDay and updateDay, all these properties come direct from the Addon instance. See https://developer.mozilla.org/en-US/docs/Addons/Add-on_Manager/Addon. installDay and updateDay are the number of days since UNIX epoch of the add-ons installDate and updateDate properties, respectively.

Notes

Add-ons that have opted out of AMO updates via the extensions._id_.getAddons.cache.enabled preference are, since Bug 868306 (Firefox 24), included in the list of submitted add-ons.

Example

"org.mozilla.addons.addons": {
  "_v": 2,
  "{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}": {
    "userDisabled": false,
    "appDisabled": false,
    "name": "Adblock Plus",
    "version": "2.4.1",
    "type": "extension",
    "scope": 1,
    "description": "Ads were yesterday!",
    "foreignInstall": false,
    "hasBinaryComponents": false,
    "installDay": 16093,
    "updateDay": 16093
  },
  "{e4a8a97b-f2ed-450b-b12d-ee082ba24781}": {
    "userDisabled": true,
    "appDisabled": false,
    "name": "Greasemonkey",
    "version": "1.14",
    "type": "extension",
    "scope": 1,
    "description": "A User Script Manager for Firefox",
    "foreignInstall": false,
    "hasBinaryComponents": false,
    "installDay": 16093,
    "updateDay": 16093
  }
}

org.mozilla.addons.plugins

This measurement contains information about the currently-installed plugins.

Version 1

The measurement object is a mapping of plugin IDs to objects containing plugin metadata.

The plugin ID is constructed of the plugins filename, name, version and description. Every plugin has at least a filename and a name.

Each plugin contains the following properties:

  • name
  • version
  • description
  • blocklisted
  • disabled
  • clicktoplay
  • mimeTypes
  • updateDay

With the exception of updateDay and mimeTypes, all these properties come directly from nsIPluginTag via nsIPluginHost. updateDay is the number of days since UNIX epoch of the plugins last modified time. mimeTypes is the list of mimetypes the plugin supports, see nsIPluginTag.getMimeTypes().

Example

"org.mozilla.addons.plugins": {
  "_v": 1,
  "Flash Player.plugin:Shockwave Flash:12.0.0.38:Shockwave Flash 12.0 r0": {
    "mimeTypes": [
      "application/x-shockwave-flash",
      "application/futuresplash"
    ],
    "name": "Shockwave Flash",
    "version": "12.0.0.38",
    "description": "Shockwave Flash 12.0 r0",
    "blocklisted": false,
    "disabled": false,
    "clicktoplay": false
  },
  "Default Browser.plugin:Default Browser Helper:537:Provides information about the default web browser": {
    "mimeTypes": [
      "application/apple-default-browser"
    ],
    "name": "Default Browser Helper",
    "version": "537",
    "description": "Provides information about the default web browser",
    "blocklisted": false,
    "disabled": true,
    "clicktoplay": false
  }
}

org.mozilla.addons.counts

This measurement contains information about historical add-on counts.

Version 1

The measurement object consists of counts of different add-on types. The properties are:

extension
Integer count of installed extensions.
plugin
Integer count of installed plugins.
theme
Integer count of installed themes.
lwtheme
Integer count of installed lightweight themes.

Notes

Add-ons opted out of AMO updates are included in the counts. This differs from the behavior of the active add-ons measurement.

If no add-ons of a particular type are installed, the property for that type will not be present (as opposed to an explicit property with value of 0).

Example

"2013-03-14": {
  "org.mozilla.addons.counts": {
    "_v": 1,
    "extension": 21,
    "plugin": 4,
    "theme": 1
  }
}

org.mozilla.appInfo.appinfo

This measurement contains basic XUL application and Gecko platform information. It is reported in the last section.

Version 2

In addition to fields present in version 1, this version has the following fields appearing in the days section:

isBlocklistEnabled
Whether the blocklist ping is enabled. This is an integer, 0 or 1. This does not indicate whether the blocklist ping was sent but merely whether the application will try to send the blocklist ping.
isTelemetryEnabled
Whether Telemetry is enabled. This is an integer, 0 or 1.

Version 1

The measurement object contains mostly string values describing the current application and build. The properties are:

  • vendor
  • name
  • id
  • version
  • appBuildID
  • platformVersion
  • platformBuildID
  • os
  • xpcomabi
  • updateChannel
  • distributionID
  • distributionVersion
  • hotfixVersion
  • locale
  • isDefaultBrowser

Notes

All of the properties appear in the last section except for isDefaultBrowser, which appears under days.

Example

This example comes from an official macOS Nightly build:

"org.mozilla.appInfo.appinfo": {
  "_v": 1,
  "appBuildID": "20130311030946",
  "distributionID": "",
  "distributionVersion": "",
  "hotfixVersion": "",
  "id": "{ec8030f7-c20a-464f-9b0e-13a3a9e97384}",
  "locale": "en-US",
  "name": "Firefox",
  "os": "Darwin",
  "platformBuildID": "20130311030946",
  "platformVersion": "22.0a1",
  "updateChannel": "nightly",
  "vendor": "Mozilla",
  "version": "22.0a1",
  "xpcomabi": "x86_64-gcc3"
},

org.mozilla.appInfo.update

This measurement contains information about the application update mechanism in the application.

Version 1

The following daily values are reported:

enabled
Whether automatic application update checking is enabled. 1 for yes, 0 for no.
autoDownload
Whether automatic download of available updates is enabled.

Notes

This measurement was merged to mozilla-central for JS FHR on 2013-07-15.

Example

"2013-07-15": {
  "org.mozilla.appInfo.update": {
    "_v": 1,
    "enabled": 1,
    "autoDownload": 1,
  }
}

org.mozilla.appInfo.versions

This measurement contains a history of application version numbers.

Version 2

Version 2 reports more fields than version 1 and is not backwards compatible. The following fields are present in version 2:

appVersion
An array of application version strings.
appBuildID
An array of application build ID strings.
platformVersion
An array of platform version strings.
platformBuildID
An array of platform build ID strings.

When the application is upgraded, the new version and/or build IDs are appended to their appropriate fields.

Version 1

When the application version (version from org.mozilla.appinfo.appinfo) changes, we record the new version on the day the change was seen. The new versions for a day are recorded in an array under the version property.

Notes

If the application isn’t upgraded, this measurement will not be present. This means this measurement will not be present for most days if a user is on the release channel (since updates are typically released every 6 weeks). However, users on the Nightly and Aurora channels will likely have a lot of these entries since those builds are updated every day.

Values for this measurement are collected when performing the daily collection (typically occurs at upload time). As a result, it’s possible the actual upgrade day may not be attributed to the proper day - the reported day may lag behind.

The app and platform versions and build IDs should be identical for most clients. If they are different, we are possibly looking at a Frankenfox.

Example

"2013-03-27": {
  "org.mozilla.appInfo.versions": {
    "_v": 2,
    "appVersion": [
       "22.0.0"
    ],
    "appBuildID": [
      "20130325031100"
    ],
    "platformVersion": [
      "22.0.0"
    ],
    "platformBuildID": [
      "20130325031100"
    ]
  }
}

org.mozilla.appSessions.current

This measurement contains information about the currently running XUL application’s session.

Version 3

This measurement has the following properties:

startDay
Integer days since UNIX epoch when this session began.
activeTicks
Integer count of ticks the session was active for. Gecko periodically sends out a signal when the session is active. Session activity involves keyboard or mouse interaction with the application. Each tick represents a window of 5 seconds where there was interaction.
totalTime
Integer seconds the session has been alive.
main
Integer milliseconds it took for the Gecko process to start up.
firstPaint
Integer milliseconds from process start to first paint.
sessionRestored
Integer milliseconds from process start to session restore.

Example

"org.mozilla.appSessions.current": {
  "_v": 3,
  "startDay": 15775,
  "activeTicks": 4282,
  "totalTime": 249422,
  "main": 851,
  "firstPaint": 3271,
  "sessionRestored": 5998
}

org.mozilla.appSessions.previous

This measurement contains information about previous XUL application sessions.

Version 3

This measurement contains per-day lists of all the sessions started on that day. The following properties may be present:

cleanActiveTicks
Active ticks of sessions that were properly shut down.
cleanTotalTime
Total number of seconds for sessions that were properly shut down.
abortedActiveTicks
Active ticks of sessions that were not properly shut down.
abortedTotalTime
Total number of seconds for sessions that were not properly shut down.
main
Time in milliseconds from process start to main process initialization.
firstPaint
Time in milliseconds from process start to first paint.
sessionRestored
Time in milliseconds from process start to session restore.

Notes

Sessions are recorded on the date on which they began.

If a session was aborted/crashed, the total time may be less than the actual total time. This is because we don’t always update total time during periods of inactivity and the abort/crash could occur after a long period of idle, before we’ve updated the total time.

The lengths of the arrays for {cleanActiveTicks, cleanTotalTime}, {abortedActiveTicks, abortedTotalTime}, and {main, firstPaint, sessionRestored} should all be identical.

The length of the clean sessions plus the length of the aborted sessions should be equal to the length of the {main, firstPaint, sessionRestored} properties.

It is not possible to distinguish the main, firstPaint, and sessionRestored values from a clean vs aborted session: they are all lumped together.

For sessions spanning multiple UTC days, it’s not possible to know which days the session was active for. It’s possible a week long session only had activity for 2 days and there’s no way for us to tell which days.

Example

"org.mozilla.appSessions.previous": {
  "_v": 3,
  "cleanActiveTicks": [
    78,
    1785
  ],
  "cleanTotalTime": [
    4472,
    88908
  ],
  "main": [
    32,
    952
  ],
  "firstPaint": [
    2755,
    3497
  ],
  "sessionRestored": [
    5149,
    5520
  ]
}

org.mozilla.crashes.crashes

This measurement contains a historical record of application crashes.

Version 6

This version adds tracking for out-of-memory (OOM) crashes in the main process. An OOM crash will be counted as both main-crash and main-crash-oom.

This measurement will be reported on each day there was a crash or crash submission. Records may contain the following fields, whose values indicate the number of crashes, hangs, or submissions that occurred on the given day:

  • content-crash
  • content-crash-submission-succeeded
  • content-crash-submission-failed
  • content-hang
  • content-hang-submission-succeeded
  • content-hang-submission-failed
  • gmplugin-crash
  • gmplugin-crash-submission-succeeded
  • gmplugin-crash-submission-failed
  • main-crash
  • main-crash-oom
  • main-crash-submission-succeeded
  • main-crash-submission-failed
  • main-hang
  • main-hang-submission-succeeded
  • main-hang-submission-failed
  • plugin-crash
  • plugin-crash-submission-succeeded
  • plugin-crash-submission-failed
  • plugin-hang
  • plugin-hang-submission-succeeded
  • plugin-hang-submission-failed

Version 5

This version adds support for Gecko media plugin (GMP) crashes.

This measurement will be reported on each day there was a crash or crash submission. Records may contain the following fields, whose values indicate the number of crashes, hangs, or submissions that occurred on the given day:

  • content-crash
  • content-crash-submission-succeeded
  • content-crash-submission-failed
  • content-hang
  • content-hang-submission-succeeded
  • content-hang-submission-failed
  • gmplugin-crash
  • gmplugin-crash-submission-succeeded
  • gmplugin-crash-submission-failed
  • main-crash
  • main-crash-submission-succeeded
  • main-crash-submission-failed
  • main-hang
  • main-hang-submission-succeeded
  • main-hang-submission-failed
  • plugin-crash
  • plugin-crash-submission-succeeded
  • plugin-crash-submission-failed
  • plugin-hang
  • plugin-hang-submission-succeeded
  • plugin-hang-submission-failed

Version 4

This version follows up from version 3, adding submissions which are now tracked by the Crash Manager.

This measurement will be reported on each day there was a crash or crash submission. Records may contain the following fields, whose values indicate the number of crashes, hangs, or submissions that occurred on the given day:

  • main-crash
  • main-crash-submission-succeeded
  • main-crash-submission-failed
  • main-hang
  • main-hang-submission-succeeded
  • main-hang-submission-failed
  • content-crash
  • content-crash-submission-succeeded
  • content-crash-submission-failed
  • content-hang
  • content-hang-submission-succeeded
  • content-hang-submission-failed
  • plugin-crash
  • plugin-crash-submission-succeeded
  • plugin-crash-submission-failed
  • plugin-hang
  • plugin-hang-submission-succeeded
  • plugin-hang-submission-failed

Version 3

This version follows up from version 2, building on improvements to the Crash Manager.

This measurement will be reported on each day there was a crash. Records may contain the following fields, whose values indicate the number of crashes or hangs that occurred on the given day:

  • main-crash
  • main-hang
  • content-crash
  • content-hang
  • plugin-crash
  • plugin-hang

Version 2

The switch to version 2 coincides with the introduction of the Crash Manager, which provides a more robust source of crash data.

This measurement will be reported on each day there was a crash. The following fields may be present in each record:

mainCrash
The number of main process crashes that occurred on the given day.

Yes, version 2 does not track submissions like version 1. It is very likely submissions will be re-added later.

Also absent from version 2 are plugin crashes and hangs. These will be re-added, likely in version 3.

Version 1

This measurement will be reported on each day there was a crash. The following properties are reported:

pending
The number of crash reports that haven’t been submitted.
submitted
The number of crash reports that were submitted.

Notes

Main process crashes are typically submitted immediately after they occur (by checking a box in the crash reporter, which should appear automatically after a crash). If the crash reporter submits the crash successfully, we get a submitted crash. Else, we leave it as pending.

A pending crash does not mean it will eventually be submitted.

Pending crash reports can be submitted post-crash by going to about:crashes.

If a pending crash is submitted via about:crashes, the submitted count increments but the pending count does not decrement. This is because FHR does not know which pending crash was just submitted and therefore it does not know which day’s pending crash to decrement.

Example

"org.mozilla.crashes.crashes": {
  "_v": 1,
  "pending": 1,
  "submitted": 2
},
"org.mozilla.crashes.crashes": {
  "_v": 2,
  "mainCrash": 2
}
"org.mozilla.crashes.crashes": {
  "_v": 4,
  "main-crash": 2,
  "main-crash-submission-succeeded": 1,
  "main-crash-submission-failed": 1,
  "main-hang": 1,
  "plugin-crash": 2
}

org.mozilla.healthreport.submissions

This measurement contains a history of FHR’s own data submission activity. It was added in Firefox 23 in early May 2013.

Version 2

This is the same as version 1 except an additional field has been added.

uploadAlreadyInProgress
A request for upload was initiated while another upload was in progress. This should not occur in well-behaving clients. It (along with a lock preventing simultaneous upload) was added to ensure this never occurs.

Version 1

Daily counts of upload events are recorded.

firstDocumentUploadAttempt
An attempt was made to upload the client’s first document to the server. These are uploads where the client is not aware of a previous document ID on the server. Unless the client had disabled upload, there should be at most one of these in the history of the client.
continuationUploadAttempt
An attempt was made to upload a document that replaces an existing document on the server. Most upload attempts should be attributed to this as opposed to firstDocumentUploadAttempt.
uploadSuccess
The upload attempt recorded by firstDocumentUploadAttempt or continuationUploadAttempt was successful.
uploadTransportFailure
An upload attempt failed due to transport failure (network unavailable, etc).
uploadServerFailure
An upload attempt failed due to a server-reported failure. Ideally these are failures reported by the FHR server itself. However, intermediate proxies, firewalls, etc may trigger this depending on how things are configured.
uploadClientFailure
An upload attempt failued due to an error/exception in the client. This almost certainly points to a bug in the client.

The result for an upload attempt is always attributed to the same day as the attempt, even if the result occurred on a different day from the attempt. Therefore, the sum of the result counts should equal the result of the attempt counts.

org.mozilla.hotfix.update

This measurement contains results from the Firefox update hotfix.

The Firefox update hotfix bypasses the built-in application update mechanism and installs a modern Firefox.

Version 1

The fields in this measurement are dynamically created based on which versions of the update hotfix state file are found on disk.

The general format of the fields is <version>.<thing> where version is a hotfix version like v20140527 and thing is a key from the hotfix state file, e.g. upgradedFrom. Here are some of the things that can be defined.

upgradedFrom
String identifying the Firefox version that the hotfix upgraded from. e.g. 16.0 or 17.0.1.
uninstallReason
String with enumerated values identifying why the hotfix was uninstalled. Value will be STILL_INSTALLED if the hotfix is still installed.
downloadAttempts
Integer number of times the hotfix started downloading an installer. Download resumes are part of this count.
downloadFailures
Integer count of times a download supposedly completed but couldn’t be validated. This likely represents something wrong with the network connection. The ratio of this to downloadAttempts should be low.
installAttempts
Integer count of times the hotfix attempted to run the installer. This should ideally be 1. It should only be greater than 1 if UAC elevation was canceled or not allowed.
installFailures
Integer count of total installation failures this client experienced. Can be 0. installAttempts - installFailures implies install successes.
notificationsShown
Integer count of times a notification was displayed to the user that they are running an older Firefox.

org.mozilla.places.places

This measurement contains information about the Places database (where Firefox stores its history and bookmarks).

Version 1

Daily counts of items in the database are reported in the following properties:

bookmarks
Integer count of bookmarks present.
pages
Integer count of pages in the history database.

Example

"org.mozilla.places.places": {
  "_v": 1,
  "bookmarks": 388,
  "pages": 94870
}

org.mozilla.profile.age

This measurement contains information about the current profile’s age (and in version 2, the profile’s most recent reset date)

Version 2

profileCreation and profileReset properties are present. Both define the integer days since UNIX epoch that the current profile was created or reset accordingly.

Version 1

A single profileCreation property is present. It defines the integer days since UNIX epoch that the current profile was created.

Notes

It is somewhat difficult to obtain a reliable profile born date due to a number of factors, but since Version 2, improvements have been made - on a “profile reset” we copy the profileCreation date from the old profile and record the time of the reset in profileReset.

Example

"org.mozilla.profile.age": {
  "_v": 2,
  "profileCreation": 15176
  "profileReset": 15576
}

org.mozilla.searches.counts

This measurement contains information about searches performed in the application.

Version 6 (mobile)

This adds two new search locations: widget and activity, corresponding to the search widget and search activity respectively.

Version 2

This behaves like version 1 except we added all search engines that Mozilla has a partner agreement with. Like version 1, we concatenate a search engine ID with a search origin.

Another difference with version 2 is we should no longer misattribute a search to the other bucket if the search engine name is localized.

The set of search engine providers is:

  • amazon-co-uk
  • amazon-de
  • amazon-en-GB
  • amazon-france
  • amazon-it
  • amazon-jp
  • amazondotcn
  • amazondotcom
  • amazondotcom-de
  • aol-en-GB
  • aol-web-search
  • bing
  • eBay
  • eBay-de
  • eBay-en-GB
  • eBay-es
  • eBay-fi
  • eBay-france
  • eBay-hu
  • eBay-in
  • eBay-it
  • google
  • google-jp
  • google-ku
  • google-maps-zh-TW
  • mailru
  • mercadolibre-ar
  • mercadolibre-cl
  • mercadolibre-mx
  • seznam-cz
  • twitter
  • twitter-de
  • twitter-ja
  • yahoo
  • yahoo-NO
  • yahoo-answer-zh-TW
  • yahoo-ar
  • yahoo-bid-zh-TW
  • yahoo-br
  • yahoo-ch
  • yahoo-cl
  • yahoo-de
  • yahoo-en-GB
  • yahoo-es
  • yahoo-fi
  • yahoo-france
  • yahoo-fy-NL
  • yahoo-id
  • yahoo-in
  • yahoo-it
  • yahoo-jp
  • yahoo-jp-auctions
  • yahoo-mx
  • yahoo-sv-SE
  • yahoo-zh-TW
  • yandex
  • yandex-ru
  • yandex-slovari
  • yandex-tr
  • yandex.by
  • yandex.ru-be

And of course, other.

The sources for searches remain:

  • abouthome
  • contextmenu
  • searchbar
  • urlbar

The measurement will only be populated with providers and sources that occurred that day.

If a user switches locales, searches from default providers on the older locale will still be supported. However, if that same search engine is added by the user to the new build and is not a default search engine provider, its searches will be attributed to the other bucket.

Version 1

We record counts of performed searches grouped by search engine and search origin. Only search engines with which Mozilla has a business relationship are explicitly counted. All other search engines are grouped into an other bucket.

The following search engines are explicitly counted:

  • Amazon.com
  • Bing
  • Google
  • Yahoo
  • Other

The following search origins are distinguished:

about:home
Searches initiated from the search text box on about:home.
context menu
Searches initiated from the context menu (highlight text, right click, and select “search for…”)
search bar
Searches initiated from the search bar (the text field next to the Awesomebar)
url bar
Searches initiated from the awesomebar/url bar.

Due to the localization of search engine names, non en-US locales may wrongly attribute searches to the other bucket. This is fixed in version 2.

Example

"org.mozilla.searches.counts": {
  "_v": 1,
  "google.searchbar": 3,
  "google.urlbar": 7
},

org.mozilla.searches.engines

This measurement contains information about search engines.

Version 1

This version debuted with Firefox 31 on desktop. It contains the following properties:

default

Daily string identifier or name of the default search engine provider.

This field will only be collected if Telemetry is enabled. If Telemetry is enabled and then later disabled, this field may disappear from future days in the payload.

The special value NONE could occur if there is no default search engine.

The special value UNDEFINED could occur if a default search engine exists but its identifier could not be determined.

This field’s contents are Services.search.defaultEngine.identifier (if defined) or "other-" + Services.search.defaultEngine.name if not. In other words, search engines without an .identifier are prefixed with other-.

Version 2

Starting with Firefox 40, there is an additional optional value:

cohort
Daily cohort string identifier, recorded if the user is part of search defaults A/B testing.

org.mozilla.sync.sync

This daily measurement contains information about the Sync service.

Values should be recorded for every day FHR measurements occurred.

Version 1

This version debuted with Firefox 30 on desktop. It contains the following properties:

enabled
Daily numeric indicating whether Sync is configured and enabled. 1 if so, 0 otherwise.
preferredProtocol
String version of the maximum Sync protocol version the client supports. This will be 1.1 for for legacy Sync and 1.5 for clients that speak the Firefox Accounts protocol.
actualProtocol

The actual Sync protocol version the client is configured to use.

This will be 1.1 if the client is configured with the legacy Sync service or if the client only supports 1.1.

It will be 1.5 if the client supports 1.5 and either a) the client is not configured b) the client is using Firefox Accounts Sync.

syncStart
Count of sync operations performed.
syncSuccess
Count of sync operations that completed successfully.
syncError

Count of sync operations that did not complete successfully.

This is a measure of overall sync success. This does not reflect recoverable errors (such as record conflict) that can occur during sync. This is thus a rough proxy of whether the sync service is operating without error.

org.mozilla.sync.devices

This daily measurement contains information about the device type composition for the configured Sync account.

Version 1

Version 1 was introduced with Firefox 30.

Field names are dynamic according to the client-reported device types from Sync records. All fields are daily last seen integer values corresponding to the number of devices of that type.

Common values include:

desktop
Corresponds to a Firefox desktop client.
mobile
Corresponds to a Fennec client.

org.mozilla.sync.migration

This daily measurement contains information about sync migration (that is, the semi-automated process of migrating a legacy sync account to an FxA account.)

Measurements will start being recorded after a migration is offered by the sync server and stop after migration is complete or the user elects to “unlink” their sync account. In other words, it is expected that users with Sync setup for FxA or with sync unconfigured will not collect data, and that for users where data is collected, the collection will only be for a relatively short period.

Version 1

Version 1 was introduced with Firefox 37 and includes the following properties:

state
Corresponds to either a STATE_USER_* string or a STATE_INTERNAL_* string in FxaMigration.jsm. This reflects a state where we are waiting for the user, or waiting for some internal process to complete on the way to completing the migration.
declined
Corresponds to the number of times the user closed the migration infobar.
unlinked
Set if the user declined to migrate and instead “unlinked” Sync from the browser.
accepted
Corresponds to the number of times the user explicitly elected to start or continue the migration - it counts how often the user clicked on any UI created specifically for migration. The “ideal” UX for migration would see this at exactly 1, some known edge-cases (eg, browser restart required to finish) could expect this to be 2, and anything more means we are doing something wrong.

org.mozilla.sysinfo.sysinfo

This measurement contains basic information about the system the application is running on.

Version 2

This version debuted with Firefox 29 on desktop.

A single property was introduced.

isWow64

If present, this property indicates whether the machine supports WoW64. This property can be used to identify whether the host machine is 64-bit.

This property is only present on Windows machines. It is the preferred way to identify 32- vs 64-bit support in that environment.

Version 1

The following properties may be available:

cpuCount
Integer number of CPUs/cores in the machine.
memoryMB
Integer megabytes of memory in the machine.
manufacturer
The manufacturer of the device.
device
The name of the device (like model number).
hardware
Unknown.
name
OS name.
version
OS version.
architecture
OS architecture that the application is built for. This is not the actual system architecture.

Example

"org.mozilla.sysinfo.sysinfo": {
  "_v": 1,
  "cpuCount": 8,
  "memoryMB": 8192,
  "architecture": "x86-64",
  "name": "Darwin",
  "version": "12.2.0"
}

org.mozilla.translation.translation

This daily measurement contains information about the usage of the translation feature. It is a special telemetry measurement which will only be recorded in FHR if telemetry is enabled.

Version 1

Daily counts are reported in the following properties:

translationOpportunityCount
Integer count of the number of opportunities there were to translate a page.
missedTranslationOpportunityCount
Integer count of the number of missed opportunities there were to translate a page. A missed opportunity is when the page language is not supported by the translation provider.
pageTranslatedCount
Integer count of the number of pages translated.
charactersTranslatedCount
Integer count of the number of characters translated.
detectedLanguageChangedBefore
Integer count of the number of times the user manually adjusted the detected language before translating.
detectedLanguageChangedAfter
Integer count of the number of times the user manually adjusted the detected language after having first translated the page.
targetLanguageChanged
Integer count of the number of times the user manually adjusted the target language.
deniedTranslationOffer
Integer count of the number of times the user opted-out offered page translation, either by the Not Now button or by the notification’s close button in the “offer” state.
autoRejectedTranlationOffer
Integer count of the number of times the user is not offered page translation because they had previously clicked “Never translate this language” or “Never translate this site”.
showOriginalContent
Integer count of the number of times the user activated the Show Original command.

Additional daily counts broken down by language are reported in the following properties:

translationOpportunityCountsByLanguage
A mapping from language to count of opportunities to translate that language.
missedTranslationOpportunityCountsByLanguage
A mapping from language to count of missed opportunities to translate that language.
pageTranslatedCountsByLanguage
A mapping from language to the counts of pages translated from that language. Each language entry will be an object containing a “total” member along with individual counts for each language translated to.

Other properties:

detectLanguageEnabled
Whether automatic language detection is enabled. This is an integer, 0 or 1.
showTranslationUI
Whether the translation feature UI will be shown. This is an integer, 0 or 1.

Example

"org.mozilla.translation.translation": {
  "_v": 1,
  "detectLanguageEnabled": 1,
  "showTranslationUI": 1,
  "translationOpportunityCount": 134,
  "missedTranslationOpportunityCount": 32,
  "pageTranslatedCount": 6,
  "charactersTranslatedCount": "1126",
  "detectedLanguageChangedBefore": 1,
  "detectedLanguageChangedAfter": 2,
  "targetLanguageChanged": 0,
  "deniedTranslationOffer": 3,
  "autoRejectedTranlationOffer": 1,
  "showOriginalContent": 2,
  "translationOpportunityCountsByLanguage": {
    "fr": 100,
    "es": 34
  },
  "missedTranslationOpportunityCountsByLanguage": {
    "it": 20,
    "nl": 10,
    "fi": 2
  },
  "pageTranslatedCountsByLanguage": {
    "fr": {
      "total": 6,
      "es": 5,
      "en": 1
    }
  }
}

org.mozilla.experiments.info

Daily measurement reporting information about the Telemetry Experiments service.

Version 1

Property:

lastActive
ID of the final Telemetry Experiment that is active on a given day, if any.

Version 2

Adds an additional optional property:

lastActiveBranch
If the experiment uses branches, the branch identifier string.

Example

"org.mozilla.experiments.info": {
  "_v": 2,
  "lastActive": "some.experiment.id",
  "lastActiveBranch": "control"
}

org.mozilla.uitour.treatment

Daily measurement reporting information about treatment tagging done by the UITour module.

Version 1

Daily text values in the following properties:

<tag>:
Array of discrete strings corresponding to calls for setTreatmentTag(tag, value).

Example

"org.mozilla.uitour.treatment": {
  "_v": 1,
  "treatment": [
    "optin",
    "optin-DNT"
  ],
  "another-tag": [
    "foobar-value"
  ]
}

org.mozilla.passwordmgr.passwordmgr

Daily measurement reporting information about the Password Manager

Version 1

Property:

numSavedPasswords
number of passwords saved in the Password Manager
enabled
Whether or not the user has disabled the Password Manager in prefernces

Example

"org.mozilla.passwordmgr.passwordmgr": {
  "_v": 1,
  "numSavedPasswords": 5,
  "enabled": 0,
}

Version 2

More detailed measurements of login forms & their behavior

numNewSavedPasswordsInSession
Number of passwords saved to the password manager this session.
numSuccessfulFills
Number of times the password manager filled in password fields for user this session.
numTotalLoginsEncountered
Number of times a login form was encountered by the user in the session.

Example

::
“org.mozilla.passwordmgr.passwordmgr”: {
“_v”: 2, “numSavedPasswords”: 32, “enabled”: 1, “numNewSavedPasswords”: 5, “numSuccessfulFills”: 11, “numTotalLoginsEncountered”: 23,

}