Looks like Elon finally forces x down everyone’s throat and every twitter.com link redirects to x.com. (Funny enough I tried Firefox Nighty and there is no redirect so maybe this is random based on UA) Also I’m not 100% sure but enhanced tracking protection probably breaks x.com because there are still API calls to twitter.com under the hood, since those are different domains it just gets blocked. Solution is either twitter fixes their shitty code or Mozilla adds exception.

They already have very experimental Linux support. You have to build whole app yourself though. I’d say that in month or two we’ll get a binary. You can track Linux porting progress in this issue

I believe they don’t store any credentials on the server. If you really don’t trust them you can also host your own instance. You can read more here

WefWef works great as a web app. Just open wefwef.app in your browser and click install in browser context menu.