# Do extension settings reference or depend on the extension's internal uuid?

**URL:** <https://discourse.mozilla.org/t/do-extension-settings-reference-or-depend-on-the-extensions-internal-uuid/146010>\
**Category:** Development\
**Created:** [September 18, 2025, 6:23pm UTC](https://discourse.mozilla.org/t/do-extension-settings-reference-or-depend-on-the-extensions-internal-uuid/146010 "2025-09-18T18:23:18Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![immortal192](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/immortal192/32/74880_2.png) [@immortal192](https://discourse.mozilla.org/u/immortal192)\
**Post date:** [September 18, 2025, 6:23pm UTC](https://discourse.mozilla.org/t/do-extension-settings-reference-or-depend-on-the-extensions-internal-uuid/146010/1 "2025-09-18T18:23:18Z")

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Do extension settings reference or depend on the extension’s internal uuid e.g. from ``storage/default/moz-extension+++<UUID>/``? Would it be problematic to sync a profile’s `storage/default/` with another (or at least an extension’s settings at `storage/default/moz-extension+++<UUID>/`) between profiles?

I’m looking to keep extension settings of my various sandboxed (via firejail) profiles consistent, e.g. settings from a “master” profile synced to the rest of the profiles. Not all extensions support Firefox’s sync feature to sync their settings (and I also prefer to self-host both the Firefox account server and Firefox sync server but have not found a straightforward way to set _both_ up).

Basically, is there a straightforward way to manually sync extension settings across profiles in a manner that is “safe”, i.e. the data that is synced is profile-agnostic so there wouldn’t be potentially security/privacy concerns? Are extension settings portable across profiles or can they be dependent on a specific profile and therefore not appropriate to sync in such a manner?

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**Author:** ![juraj.masiar](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/juraj.masiar/32/30587_2.png) [@juraj.masiar](https://discourse.mozilla.org/u/juraj.masiar)\
**Post date:** [September 18, 2025, 7:35pm UTC](https://discourse.mozilla.org/t/do-extension-settings-reference-or-depend-on-the-extensions-internal-uuid/146010/2 "2025-09-18T19:35:18Z")

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Yes, at least IndexedDB does.  
Last time I’ve tried to copy corrupted DB of a temporary loaded addon into a different Firefox profile (into some `\storage\default\moz-extension+++7556ad3f-f005-4ded-a4f5-89512f881efe` folder), it failed with this error in the browser console:

> 12:59:31.134 Quota The name of the origin directory (moz-extension+++7556ad3f-f005-4ded-a4f5-89512f881efe) doesn’t match the sanitized origin string (moz-extension+++f3fecdff-5c3b-4a82-9233-91194e4d7807) in the metadata file!: ActorsParent.cpp:3981 2

But I don’t have more info… I only know that copying whole profile helps.

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**Author:** ![dotproto](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/dotproto/32/62957_2.png) [@dotproto](https://discourse.mozilla.org/u/dotproto)\
**Post date:** [September 19, 2025, 6:23pm UTC](https://discourse.mozilla.org/t/do-extension-settings-reference-or-depend-on-the-extensions-internal-uuid/146010/3 "2025-09-19T18:23:32Z")

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Firefox’s `browser.storage.local` is built on top of IndexedDB. Given what @juraj.masiar shared, I expect the answer is yes, it would be problematic to sync a profile’s `storage/default/` or `storage/default/moz-extension+++<UUID>/` directory with another.