I recommend downloading the Firefox Unbranded version: https://wiki.mozilla.org/Add-ons/Extension_Signing#Unbranded_Builds https://wiki.mozilla.org/Add-ons/Exte

I recommend downloading the Firefox Unbranded version: https://wiki.mozilla.org/Add-ons/Extension_Signing#Unbranded_Builds https://wiki.mozilla.org/Add-ons/Extension_Signing#Unbranded... There you can change the options in `about:config` (these options do not work in the main version of Firefox) ` xpinstall.whitelist.required on false xpinstall.signatures.required on false extensions.legacy.enabled on true ` And then every extension works, even experimental and a large part of those based on the former API. In principle, the Firefox Unbranded version should be the most promoted because it has fewer restrictions on extensions. Even such a version with default options set in `about:config` should exist, and with a larger extension base than AMO.