[lub]

> Moving the feature into a plug-in was a really dumb move though. It totally killed discoverability of this unique selling point of Firefox.

It's actually usable now without extra addons. Just right click the "+"/new tab button or go to about:preferences#containers diretly.

[GekkePrutser]

Oh did they put it back in the mainline? I still have the addon installed. I'll give it a try, thanks for the heads up.