- Opens a tab to a random website after installation
- Does not color inactive tabs.

after update FF from... 3.6 this addon was very helpful, but now, its useless. and when i use dark skin, its totally failed. solors....omg my eyes feel sharp pain! and most of all. colors per tab changes only whel i click on it!!!!!! but im need to change color before i open tab! to separate per one in many opened ( now its impossible ( very sad.....

This extension no longer works like it used to. Used to be my favorite. Really disappointing.

What happened to the "old" Colorful Tabs, like your screenshot shows? This current version is completely useless! I removed it and will look for something else.

Totally useless.
Changes colors without prompting for agreement.
Changes all colors.
Changes colors all the time, whenever one navigates.

Very counter-productive...

It definitely changes the colors of the tabs.... and everything else. Makes the browser look childish and annoying. Uninstalled.

It do not works.
After 5 years of usage it stops to work.

it dont work in the garbage of firefox dev 88+... it will be nice if can fix the problem on this firefox..

It was my favorite extension for more than 10 years, so disappointed!!! Thanks to "par Blade, il y a 8 mois" for a replacement solution ++

Sadly, this add-on no longer delivers what it advertises, it only acts as a donation trap.
I used it with the previous versions of Firefox, and really sad to see it go - but it is gone, have no doubt, as other add-ons could already solve this problem with the new Firefox versions. Just go with Tree Style Tabs and TST Colored Tabs.

I would gladly change mu one star to 5 stars once dev. changes it to work as it used to work. I want to change the tabs and nothing else, I also want different coloring on different tabs, like one for active tab, one for the others, per site coloring.
But I don't want my entire browser to change color. :(
I really hope this previously great extension can be fixed.

The"new" colourful Tabs has nothing to do with the old one, which is shown in the screenshot. Actually it only colours the actual tab-and in the same coulour nearly the whole rest of the firfox header, exept the remaining tabs. The Top line colours change each time, you choose an other tab-which is more a nerve taking lightshow, because of the shrill colours, than helpful, as it was earlier! (and as it is shown falsely in the screenshot)

No longer works with the Tree Style Tab add-on so will need to look elsewhere or go without colors.

Geht seit dem letzten Update nicht mehr, jetzt ist firefox leider farbenlos.:-(

The 11/15/2019, update killed ColorfulTabs. The color is gone! Please fix or it is useless!

used to be a good addon. now its useless. doesnt do anything out of the ordinary. doesnt colour any tabs at all. waste of time installing it.

I thought this would be like the old colorful tabs, it is not! It removed my themes, and introduced a bunch of garbage.
I forgot about this extension. It is terrible.
It says should be the first extension you install, it should be removed the add-ons page!

I love to have the OLD colorful tabs back but this one CHANGED MY THEME but NOT MY TABS