Rated 4 out of 5 stars

I love your extension, but I like it more for the fading tabs feature than the colorful tabs. I'm wondering if it would be possible to create a new extension called Fading Tabs or something like that? I think a lot of people would love to have that as a separate extension. Fading Tabs is definitely one of the best features out there!! Thanks if you can. Keep up the great work on your awesome extension!!

This review is for a previous version of the add-on (4.6.5). 

You can already do that

You can already do that. Just use colorfultabs without the colors. You'll need to set the coloring scheme to domain based. And set a domain preference of "." to -moz-box.