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You must be using either the Developer Edition, ESR, nightly or some unbranded version. Vanilla Firefox doesn’t allow to install unsigned extensions permanently.


As of recentlyish, I noticed this is not an option on ESR, either. Only Nightly and Dev.

https://wiki.mozilla.org/Add-ons/Extension_Signing#FAQ

The FAQ says that in ESR, xpinstall.signatures.required should be respected but this is out of date IME (ESR 115).




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