ColorfulTabs od Shivanand Sharma

The first addon you should be installing on a fresh Firefox install. A must have. The most beautiful yet the simplest add-on that makes a strong colorful appeal. Colors every tab in a different color and makes them easy to distinguish while beautifying the overall appearance of the interface. An essential. A comment from one of the millions users...

"...Just wanted to let you know I absolutely love your Colorful Tabs add on
for Firefox! It's one of the best and my personal favorite of all add
ons available. Thank you so much for this!..."

Previous versions are available at https://addons.mozilla.org/en-US/firefox/1368/history/