FF new window command disabled with TFT Rated 1 out of 5 stars

I have the same problems with as mentioned by ColleenFR on August 7, 2008 :
New Window command is not responding anymore. Also no new windows opened when e.g. opening mediaplayer from a link in a wbpage. I als have the XML error when I try to view Text Formating Options. When I disable it the 'new window' problems are gone.

This review is for a previous version of the add-on (