I upgraded today to Firefox 5.0 and when I did the X on each tab to close that tab went away. I thought it might be one of my add-on's and i restarted in safe mode with all add-on's disabled and it was still the same. I know in the preview of firefox 5.0 that each tab should have an X on it because that's how the picture showed it, but nothing i'm doing is changing it. So every tab I want to close I have to right click on it and select "close tab" which is extremely annoying because I open and close a lot of tabs.

I searched around the firefox help forums and on google to see if anyone has posted anything about this, but I can't seem to find any help. I'm trying to avoid uninstalling 5.0 and reinstalling 4.0 and readding all my add-on's because it's very tedious and time consuming. I've already spent enough time trying to figure out how to get the close tab X back. (I thought it was one of my addon's called Colorful tabs because I had read something about a problem with that addon and i uninstalled it, but it didn't change anything. the troubleshooting info below doesn't have colorful tabs in it)