![Image](http://i204.photobucket.com/albums/bb177/Rochey_bucket/firefoxnorm.jpg)
And here's how it looks when it changes:
![Image](http://i204.photobucket.com/albums/bb177/Rochey_bucket/firefoxodd.jpg)
It seems to change completely at random. If there's some sort of trigger for it then I can't find it. Once it's change it can't be turned back - the browser needs to be turned off if you want to get it back to normal. Though even when the new appearance has appeared, simply opening a new window will display the original version. I should stress that the new appearance doesn't actually do anything. I can still use it fine and the buttons all still work. It just annoys me.
So, has anyone else seen this? If so, just what the hell is it?