# Are there unsigned extensions on AMO?

**URL:** <https://discourse.mozilla.org/t/are-there-unsigned-extensions-on-amo/7504>\
**Category:** addons.mozilla.org\
**Created:** [March 9, 2016, 6:18pm UTC](https://discourse.mozilla.org/t/are-there-unsigned-extensions-on-amo/7504 "2016-03-09T18:18:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dex](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/dex/32/21615_2.png) [@dex](https://discourse.mozilla.org/u/dex)\
**Post date:** [March 9, 2016, 6:18pm UTC](https://discourse.mozilla.org/t/are-there-unsigned-extensions-on-amo/7504/1 "2016-03-09T18:18:11Z")

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Hello.

I encountered an old extension on AMO, which is unsigned:  
[https://addons.mozilla.org/pl/firefox/addon/get-file-size/](https://addons.mozilla.org/pl/firefox/addon/get-file-size/)

I thought that all extensions are signed. Why this specific add-an is unsigned?

Are there more of them?

Under what conditions add-on listed on AMO is happening to be not signed?

Thanks.

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**Author:** ![jorgev](https://avatars.discourse-cdn.com/v4/letter/j/71c47a/32.png) [@jorgev](https://discourse.mozilla.org/u/jorgev)\
**Post date:** [March 9, 2016, 11:42pm UTC](https://discourse.mozilla.org/t/are-there-unsigned-extensions-on-amo/7504/2 "2016-03-09T23:42:46Z")

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Add-ons that have very old compatibility (pre-firefox 4, I think) weren’t signed, since they wouldn’t work anyway. They are still present on AMO for historical purposes, though the question of whether they should be there at all has been brought up a few times.