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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