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# 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