If you're reading this, I made it onto Twitter/pony.social with my Asahi Linux Firefox! So that's okay. Good news: uBlock Origin works just fine.
Bad news: KeePassXC fails when integrating with Mozilla Firefox. Seems like keepassxc-proxy is missing? Wasted 30min trying to fix, lol. I'm just gonna copy-paste things normally, secure and easy built-in password-fill be damned.