Firefox / Admin panel issues

I am having several issues with WordPress 3.2.1 and Firefox on one specific computer and do not know how to fix it:

The symptoms: The admin panel is broken in many parts.
– I cannot expand/collapse the menu bar sections on the left side and other expandable things
– I cannot switch between the visual and html views of the post/page editor
– I cannot read the text in that editor since its written white on white. I can only see it if I select the text
– I cannot drag/drop widgets to the sidebars.

What I have tried to narrow down the issue:
– I used several versions of Firefox on that PC, 5.0.1 and 6 Beta
– I started it with add-ons disabled
– I tried several different wordpress installations, it happens on all of them.
– It works fine in other browsers on the same PC and other firefox browsers on different PCs.
– I emptied the cache
– I went to the website of CKEditor and tried their demo, it worked fine.
– I went to JAva.com and checked that I have the latest version.

I assume this has to do with Javascript?