We're pretty good about making sure there's always an active tab, but I believe there's a few edge cases. Of course there can't be an active tab if there are no non-app tabs, but in every other situation we can, and probably should, make sure there's always an active tab. Starting with Aza for UX buy-in.

Agreed. Ian, are there particular edge cases you'd like me to spec?

Reassigning to nobody as it is ready for implementation.

(In reply to comment #1) > Ian, are there particular edge cases you'd like me to spec? Nothing specific, though things might come up during implementation.

Note that we can't do this until bug 596729 is fixed; we're using the null selected tab to mean that an app tab was the last tab used (so we can return to it) in bug 595374. Bug 596729 will need to sort this out by making it possible for app tabs to be selected.

bugspam (moving b9 to b10)

bugspam (removing b9)

Depends on bug 596729, which we punted on for fx4.

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.