Love the fact that I could come back to FF now that tab groups are available, but there are still some pretty significant (and basic) features missing (Disclaimer, these are all related to vertical tab layout):
1. Allow reordering of the groups. I cannot find any way to drag them or reorder them otherwise outside of deleting and creating the groups in the exact order I want them to appear.
2. Sync tab GROUPS between devices with FF Sync. I have groups with upwards of 10-20 tabs in each, and while I can see all the tabs across devices, I have to open each one individually, then re-group them on the other device. If you are syncing tabs, sync the groups as well and let us open the entire group at once, while restoring the group name/color as well. Arc does this the best, syncing every single change to tabs and groups across browser/platform (Mac/Win at least).
3. Allow larger font sizes for group names, or extendable color bar across the whole sidebar. Allow color picker instead of just 9 colors that may or may not work for someone's workflow or palette.
4. Add "New Tab" button or "+" button within the expanded tab group interface so we can create a new tab INSIDE of a specific group instead of a "loose" tab that we then have to drag into the desired group.
5. Split tabs / side-by-side are available in almost every other major browser and have been for a long time. This is a significant workflow enhancer that FF needs to have to stay competitive.
Hoping some of these are in progress but really nice to see FF catching up on the vertical tab and grouping features.
