Ohodnoceno 4 z 5 hvězdiček

I love the idea of this, so it get 4*. However, even though the Strikethrough button shows up on the compose toolbar, it often does nothing. However, disabling it, and then restarting TB, and then enabling the add-on usually makes it work.

I understand your frustration and am very sorry it doesn't work for you. I need to do some debugging but haven't had time yet. I have found that it sometimes doesn't work for me as well. What usually will make it work is turning it off and back on under the Tools/Add-ons... menu while the program is running.