The Mull version of Firefox has always had extension support, never even knew the official version had even removed it. Mull is otherwise identical with some hardening against tracking and removed telemetry. I’ve also never had issues with sites breaking which can be otherwise common with hardening
You’ve left an anti-China warmongering echo chamber for a place where moderation isn’t predicated on silencing dissent against the west. The people you describe as ‘pro-China’ bots have plenty of issues with Chinese policy decisions. Accepting that the USA and capitalism more generally are evil forces in world politics are not state generated.