Review for Thunderbird Conversations by PhotoN
Rated 4 out of 5 stars
Works almost like Google. If You get used to use this method of mapping your mail, You'll like it.
It would be even better. if:
1/ Thare are an ability to configure it somehow. E.g.: I would like to have the tab-bar on the head with reply buttons. It's uncomfortable to use the context menu on right click only.
2/ Thare are an ability to turn the functionality on and off *without* disabling the extension, reloading.
To create your own collections, you must have a Mozilla Add-ons account.