When I last explained how to hack Firefox to get Safari style tabs, there was a missing element - close buttons on each tab. There is an extension to do this called Tab X, but it only seems to work on the Mac when using certain themes, not including the default mac theme. Fortunately, a nice fella called Chad has now created a mac version, which you can install directly from here, and it works a treat.
There are just a few fixes that need to applied after this. I couldn’t get the preference to hide the tab-bar close button to work. No problem, this just gets added to the userChrome.css file:
/* Tab X mods */
/*