# Firefox on Glean (FOG)

Firefox on Glean (FOG) is the name of the layer that integrates the
[Glean SDK][glean-sdk] into
[Firefox Desktop](https://www.firefox.com/).

The [Glean SDK][glean-sdk]
is a data collection library built by Mozilla for use in its products.
Like [Telemetry][telemetry], it can be used to
(in accordance with our [Privacy Policy][privacy-policy])
send anonymous usage statistics to Mozilla in order to make better decisions.

If you have any questions,
please reach out to the team on
[#glean:mozilla.org][glean-matrix].

```{toctree}
:titlesonly:
:maxdepth: 2
:glob:

user/index
dev/index
```

[telemetry]: ../telemetry/index
[glean-sdk]: https://github.com/mozilla/glean/
[book-of-glean]: https://mozilla.github.io/glean/book/index.html
[privacy-policy]: https://www.mozilla.org/privacy/
[glean-matrix]: https://chat.mozilla.org/#/room/#glean:mozilla.org