Works!
For those who don't understand: Confirm the addons popup with "OK" until you get some which ask you if you wanna leave the page. Tell them you wanna stay. This may take a while.
It may help if you click the white pages you see in between (not the one where you see Twitter loading its standard page). At least it feels like it does to me.

どうやら対策されたっぽい。