We use the
severity field in Bugzilla to indicate the scope of a
bug’s effect on Firefox.
The field is display alongside the bug’s priority.
--: Default for new bugs
N/A: (not applicable): Only applies to bugs of type Task or Enhancement.
S1: (Catastrophic) Blocks development/testing, may impact more than 25%
of users, causes data loss, potential chemspill, and no workaround available
S2: (Serious) Major Functionality/product severely impaired and a
satisfactory workaround doesn’t exist
S3: (Normal) Blocks non-critical functionality and a work around exists
S4: (Small/Trivial) minor significance, cosmetic issues, low or no impact to users
By default, new bugs have a severity of
Rules of thumb¶
A crash may be be a ``S1`` or ``S2`` defect, but not all crashes are critical defects
If a bug’s severity is
S2then it must have an
The severity of most bugs of type
Do not assign bugs of type