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# Storage
Both FOG and the Glean SDK require some storage in the
[Firefox Profile Directory](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Multiple_profiles).
## FOG
At present FOG's storage is limited to its [preferences](preferences.md).
## Glean SDK
The Glean SDK stores things in the
[Glean Data Directory](https://mozilla.github.io/glean/book/dev/core/internal/directory-structure.html)
which can be found at `<profile_dir>/datareporting/glean`.