Mozilla Connect

Yes to this! And please also support IMAP Keywords (ie, the ability for tags that are stored server-side to be read and displayed), same as Thunderbird Desktop supports. 

YES, would love to see this added back -- was very bummed when it was removed a while back.

This seems related to / dependent on Sync:https://connect.mozilla.org/t5/ideas/firefox-sync-for-thunderbird/idi-p/28971