Firefox showing code

[Messiah Khan]

Something annoying keeps happening to firefox. After a while, it keeps showing me the code of the page, rather than the page contents. To fix it, I have to close down firefox and open it again. Anyone know what is causing this and how to fix it?

 

[Messiah Khan]

New tab button on tab bar 1.0
New tab homepage 0.3
Download statusbar 0.9.4

Im sure I had all these installed before without any problems, although it might be a conflict with them with firefox version 1.5.