Unless I'm mistaken, the Android Firefox app used to have group tabs and was replaced by Collections. Personally, I find it less user friendly and requires more clicks while ending up with a worse version of what Group Tabs accomplished. It essentially operates as a weird mix of Group Tabs and Bookmarks while being worse than both. Cons of Collections: * There is no differentiation between tabs in a collection and not in a collection. * There is no quick swapping between tabs in a collection. * There is no option to Close all tabs in a collection but there is one to Open all tabs. This just looks messy. * Collections can only be opened from Homepage, not the Tabs screen. * Saving a collection requires long-press, select tab(s), tap Collection icon, then select a Collection. Group tabs requires longpress, select multiple, tap group icon OR drag and stack tabs. Pros of Collections: * Neatly stored on Homepage instead of taking up a Tab slot on Tab page. (which could be fixed be programming group tabs ability to be stored on Homepage and re-opened with option). All in all it is just a 5/10 feature in functionality. Even less so when taking into account that Android Firefox also has Bookmarks and Shortcuts. Please go back to drawing board on this one, it's really one feature I miss about Chrome (and what I thought Firefox used to have).