Rated 2 out of 5 stars

Very obtrusive and annoying. The docked window didn't want to close, and the icon for drag & drop followed my mouse cursor around constantly, as opposed to showing up only when something was selected. It also messed up the layout, causing elements of Thunderbird's UI to "jump" out of place when it passed, and even caused the translator window's content to stretch so far out of place I could no longer reach the button to close it. The translation itself seemed okay, but it was just too annoying an addon to keep using it.

This review is for a previous version of the add-on (4.7.1-signed).