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That happens with every extension that i try to install.

Any idea what is going wrong ?

Trying to add extension:

pomsky
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    This looks like the recent bug with Firefox that automatically breaks addons, not an issue with the GNOME extensions website. Possible duplicate of [FireFox 66 Quantum disabled all my extensions at midnight!](https://askubuntu.com/questions/1140473/firefox-66-quantum-disabled-all-my-extensions-at-midnight) – pomsky May 05 '19 at 13:45
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    Fixed it, your post helped ! Thanks – Alex Kalaidjiev May 05 '19 at 15:52

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