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.

My tabs did not change color as shown in the screenshot.

Only seems to randomly cycle through colors for each tab, never quite settling on any one color per tab.

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

Firefox is determined to be the worst browser. Now Colorful Tabs doesn't work. Only the current tab is colored, the rest are white, which makes Colorful Tabs worthless!

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

This is great for the tabs on the sidebar, but the tabs across the top of the page are white except for the active tab. I receive a message about bugzilla, but cannot fix it.

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 ++

only the active tab is colored but the other inactive tab are not colored .
like you show in the screenshot of the addon .

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.

This add-on would've been great if it was compatible with Tree Style Tabs; which it isn't and that's okay.

I wouldn't be surprised if all ~50k users of this add-on does NOT use Tree Style Tabs, but I'm surprised this isn't a recommended add-on considering the amount of users.