Can't find how to allow unsigned addons

[Mattbas (Mattia Basaglia)]

Pretty much all the addons I have have been disabled and can’t find a way to re-enable them because they aren’t signed.

I have some addons that I have hacked together myself and aren’t distributed anywhere, can I install them even if they aren’t signed?

[SJW]

Please have a look at the announcement:

Certificate issue causing add-ons to be disabled or fail to install

Certificate issue causing add-ons to be disabled or fail to install: 10:50 a.m. UTC / 03:50 a.m. PDT: We rolled-out a fix for release, beta and nightly users on Desktop. The fix will be automatically applied in the background within the next few hours, you don’t need to take active steps. In order to be able to provide this fix on short notice, we are using the Studies system. You can check if you have studies enabled by going to Firefox Preferences -> Privacy & Security -> Allow Firefox to in…

For your own unpublished Add-Ons you can flip the pref xpinstall.signatures.required in about:config (but this might only work in beta and nightly releases).

[mtalbot]

Changing xpinstall.signatures.required to false also works in FF 66.03 (It saved me a LOT of trouble). Once Mozilla fix their problem properly, remember to change the setting back to true.