[725686]

Sorry to bomb you like this, but I don't have the time/energy to find where to file a ff container bug: twitter.com never opens in it's designated container for me. That is the only site I always have to "Reopen in container".

[girzel]

Same here: that's the only site that doesn't work. I wonder if it has something to do with the post-login redirects: it's impossible to say "always open this site in this container", because you've already been redirected to a different url.

[extra88]

Works for me, maybe the issue is specific to the site linking to Twitter.