Rated 4 out of 5 stars

FabTabs is almost better than ColorfulTabs! I say almost because of 3 points: One is it slows down FF enough to actually notice compared to CT; two is while it's page-dominant coloring and active tab drops down feature are nice, it doesn't also color the line across the top of the page connected to the tab like CT does; and three, sometimes using a page's dominant color (that's too dark e.g.) and it changing the tab text to white (e.g.) makes it a bit unreadable. But overall, a well done alternative. :)

This review is for a previous version of the add-on (1.2.1).