The beta version in the development channel works reasonably well.
Beware: This add-on paints colored rectangles on tabs. Using it with rounded tabs may make your eyes puke! I suggest installing "Classic Theme Restorer" and use rectangular tabs "v2" (this add-on don't work with "v1").
Don't let the "Not available for Firefox (Insert crazy number version here)" fool you, just go down to the "development channel" and release the beta. It works form me with v25. There are no addons like this one officially compatible with the latest versions, so the developers should take a few minutes and identify it with the latest versions so this jewel don't go buried and forgotten.
This extension appears to be dead, which is a shame because it was a great and useful extension. I wish a new version for Firefox 8, 9, and above would come out, but I'm not holding my breath. R.I.P. ChromaTabs
Easily the best colored tab add-on for firefox 4+. Looks fantastic.
My only suggestion would be to add an option to change the tab base background for the inactive tabs. I think if you could just change the opacity for the tab base background on those tabs it would be easier to distinguish which tab is active and which arent.
For those having problems with compatibility just install this addon
Thank you and 4 stars "in memoriam" of a very usefull litle FF-Add-On which I really liked untill FF v3. After forced updates (of a self-crippled browser that cuts of more and more of its usability with every version while crashing more often than MSIE in its worst days) here is one more usefull function that does not more than to fill an entry in the add-on-list. How sad.
I am using the beta version for FF 4 and I really really enjoy it. Has just the right look. And customizable. I tried ColorfulTabs and found the look to be very cartoonish and cheesy. ChromaTab adds color while maintaining a sleek and professional look. 5 stars!
I am using version 3 beta on Firefox 4. Sometimes colors on tabs(probably the first one) do not appear until the tab is hovered once. Also with tabs on top it does not smoothly blend with the navigation toolbar and should be fixed for the active tab. Perhaps you may keep active tab in default color, or maybe you can extend the idea of tabs-bottom to the navigation toolbar. Also the title chenged notification for app tabs no longer holds. There should be an option to handle that. Keep up the good work.
Un-installed CTP after 2 days of heavy use. Too dark on a lot of the tabs making it difficult to see the text on the tab. I've found Colorful Tabs to be much more easier on the eyes. For every tab I have open I can actually see the text on the tab. This is just my personal view of course & CT fits my personal needs. Others may not be bothered by the often use of really dark colors on the tabs, & may not care whether or not they can see what the tab actually says.