I just found an interesting bug in Firefox v1.5.0.6 when running in Vista RC1.

If you delete all your bookmarks in your Bookmark Toolbar, the display/browser area of Firefox goes crazy and twitches up and down. Only when you add something back into the Bookmark Toolbar does it stop twitching. Check out this animated gif of this behavior:

I know it's hard to see, but the twitching motion just keeps going and is very fast. The twitching happens to all Firefox windows with the Bookmark toolbar visible. I don't think anything bad happens, it just gets annoying after the first 5 seconds of finding it funny.

The 2 ways I found to fix this is to:

  1. Add something back into your Bookmarks Toolbar .. or ...
  2. Remove the Bookmarks Toolbar.

I guess it's bugs like these why the Mozilla team has accepted Microsoft's invitation to help make sure Firefox works on Vista. Other than this weird twitching, I haven't noticed any other problems running Firefox on Vista.