Nope, it didn't have that feature, though it had some basic foundations. It got removed as several others firefox features for no good reasons. There's also ta

Nope, it didn't have that feature, though it had some basic foundations. It got removed as several others firefox features for no good reasons. There's also tab groups and tab groups helper but those are about to disappear[1] and make firefox useless for this use case. [1]: http://fasezero.com/ http://fasezero.com/