I though I was the only one who had this problem Rated 5 out of 5 stars
Its funny, but I had no idea how much the default behaviour of firefo annoyed me, until I installed this addon.
close last tab > enter app tab > click a few links > realise you just messed up your whole 'system' and frantically click the back button > forget what you were looking for > click forward > mess up app tab AGAIN
I wish that opening a new normal tab when closing the last one was a buildin choice in the Firefox options menu, but at least now I can use this addon. Thanks a milion!