firefox shows blank page for permanent link and comment

I have a problem with firefox since yesterday – and have to say that it before always worked well. When I go on the permanent link or comment I only get the sidebar loaded but no main page … and this only in firefox !! .. I tried around and yesterday found a comment that it might be due to plugins, but have enabled almost all of them and it did not help – especially I did not install new ones and before it had worked. …
http://www.mindgap.org I really would appreciate a suggestion what could be the reason for this… thank you