This just happened today. Running 1.0PR. I haven't installed the new 1.0 release of Firefox.
The admin menu renders stacked - top to bottom now - with a few of the sub menu items missing to the left. It used to be left to right.
This does not occur in IE 6.0.
I haven't been hacking at any files, nor changing any layouts. It just started to happen.
Very strange. Closed Firefox. Restarted computer. Still, renders weird.
Just wondering if anyone has experienced this before. Searched for Firefox and Admin menu issues. Couldn't find any. Maybe just a fluke?