We don't even have it on desktop, yet. I wouldn't use them as much as I do at work, where I use them to actively manage dynamic workflows. But it sure would be nice to be able to collapse some shopping tabs I typically have open, into one pinned tab group, or researching various projects.

Once they do it, I sure hope they put some more thought into how pinned tab groups should behave. They should either be to the left of all pinned tabs, or between pinned tabs and unpinned tabs. It drives me crazy in Edge, how new tabs tend to open to the left of my pinned tab groups.

Actually, I exclusively use Firefox Focus on my phone, so I don't really care there. But I do wish they'd get out of this half-assed support for tabs, there. Just let me create new tabs without long pressing links. Maybe put a limit on number of tabs to 3 or 5. I'd also love to have a "send to desktop" option, without having to go to regular Firefox and tab sync.