# Duplicate UUID error when uploading Firefox extension to review

**URL:** <https://discourse.mozilla.org/t/duplicate-uuid-error-when-uploading-firefox-extension-to-review/3921>\
**Category:** addons.mozilla.org\
**Created:** [September 8, 2015, 8:54am UTC](https://discourse.mozilla.org/t/duplicate-uuid-error-when-uploading-firefox-extension-to-review/3921 "2015-09-08T08:54:25Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![avg\_user](https://avatars.discourse-cdn.com/v4/letter/a/41988e/32.png) [@avg\_user](https://discourse.mozilla.org/u/avg_user)\
**Post date:** [September 8, 2015, 8:54am UTC](https://discourse.mozilla.org/t/duplicate-uuid-error-when-uploading-firefox-extension-to-review/3921/1 "2015-09-08T08:54:26Z")

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Hi,

When sending our side-loading extension to review I get “Duplicate UUID error”.  
Assuming UUID are never duplicated upon normal generation.  
I found it hard to believe that another extension uses our UUID.

I suspect that maybe at some time we sent the extension to the store, and removed it…  
How can I inquire this?

We cannot change the UUID because we have existing users with the extension (so we couldn’t update them), and we don’t want to enter the funnel again…

Help! 😐

Thanks,  
Boaz.

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**Author:** ![TheOne](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/theone/32/49872_2.png) [@TheOne](https://discourse.mozilla.org/u/TheOne)\
**Post date:** [September 8, 2015, 12:52pm UTC](https://discourse.mozilla.org/t/duplicate-uuid-error-when-uploading-firefox-extension-to-review/3921/2 "2015-09-08T12:52:06Z")

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Please send an email with the add-on ID in question to amo-admins at mozilla dot org.

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**Author:** ![avg\_user](https://avatars.discourse-cdn.com/v4/letter/a/41988e/32.png) [@avg\_user](https://discourse.mozilla.org/u/avg_user)\
**Post date:** [September 8, 2015, 1:44pm UTC](https://discourse.mozilla.org/t/duplicate-uuid-error-when-uploading-firefox-extension-to-review/3921/3 "2015-09-08T13:44:10Z")

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Thanks!

I will.