Absolutely Fabulous Rated 5 out of 5 stars
I keep telling people there are just two extensions that have made my browser both beautiful and sensible: Tabs Always in Titlebar and FabTabs. (OK - Tab Utilities too)
In my opinion most of the readability gripes I've seen here can be handled with the extension's options, as well as Tab Utilities >Options >Appearance >Tabs - although admittedly I don't bother with personas or much in the way of themes - with FabTabs I just don't feel the need.
The Captain is a pretty awesome fellow and author of some other extensions as well and has his own forums on his website where he listens. Upon my suggestion he wasted no time at all in extending the FabTab (new version 1.4.4) treatment to my Vertical Toolbar. Oh yeah, the gradiated button coloring is really cool too.
I love my FabTabs and don't understand why more people don't use it. If they're that hung up on their precious personas you'd think they might also try a little simple tweaking.