Firefox window won't close Rated 2 out of 5 stars

https://support.mozilla.com/tiki-view_forum_thread.php?forumId=1&comments_parentId=388232

I also had to disable SpanishTrans in order to be able to close my browser window. Using a MacBook.

This review is for a previous version of the add-on (1.5.1-signed.1-signed).