Create a tab group layout similar to the one in the screenshot. Basicly, have one big group and at least one narrow one. The big group only has one or two tabs at that point, so the previews are huge. Now try to move them to the small group. I was not able to do this. It started working after making the small group about twice as tall as shown in the screenshot (making the big group smaller at the same time). IMHO, the tab preview should shrink to a more manageable size (3-4 times the size of the mouse pointer maybe) when dragging. That way it is easier to hit the drop target and they don't cover half the screen.

Agreed. We originally had resizing on drag (once the tab left the group it started in), but the animation was a little funky (for one thing, it resized around the upper left corner, rather than the cursor; looked funny for big scale changes). We should fix those issues and get it back in.

bugspam (moving b9 to b10)

bugspam (removing b9)

Sean, I'd be happy to take this off your plate.

[bugspam: mitcho's late-night betaN triage; feel free to comment or reverse]

bugspam: returning Sean's bugs to the pool

bugspam

bugspam

bugspam

bugspam (Fx7 was branched, removing open bugs from Fx7 meta bug, we won't create new meta bugs for upcoming Fx versions)

Panorama has been removed from Firefox 45, currently in Beta and scheduled for release on March 7th. As such, I'm closing all existing Panorama bugs. If you are still using Panorama, you will see a deprecation message in Firefox 44, and when 45 is released your tab group data will be migrated to bookmarks, with a folder for each group. There are also a few addons offering similar functionality. See https://support.mozilla.org/en-US/kb/tab-groups-removal for more info. We're removing Panorama because it has extremely low usage (about 0.01% of users), and has a large number of bugs and usability issues. The cost of fixing all those issues is far too high to justify, and so we'll instead be focusing our time and energy on improving other parts of Firefox.