"Prevent another message from being selected in ThunderBird with Unselect Message, a useful add-on." (19 words)
With Unselect Message for ThunderBird, you can even click into the empty space below the last message in the thread list to unselect the currently selected message and to clear the preview pane. This is particularly useful when dealing with spam or unwanted messages that you want to delete without accidentally selecting the next one.
It's worth noting that Unselect Message for ThunderBird extension works best with the "Remember the last selected message" option unchecked. If you have this option checked, the last message Thunderbird remembers will be the one that was selected before you unselected all of them.
In summary, if you're looking for a way to stay in control of your message selection in Thunderbird, then Unselect Message for ThunderBird is definitely worth checking out. This extension is compatible with ThunderBird 1.0 - 1.6.
Version 1.3: N/A