You can try VivaldiFox to replace ColorfulTabs: https://addons.mozilla.org/en-US/firefox/addon/vivaldifox/

For gesture add-ons you can find a replacement with this handy website: https://github.com/mozilla/extension-finder

So you're saying there's no fix to make ColorfulTabs or Gesturefy work on Firefox 57.0?

firefrost7 said

So you're saying there's no fix to make ColorfulTabs or Gesturefy work on Firefox 57.0?

Correct though there is no red banner saying not compatible with ver 57 and the page was updated 3 days ago. https://addons.mozilla.org/en-US/firefox/addon/colorfultabs/ and this one was updated 3 days ago : https://addons.mozilla.org/en-US/firefox/addon/gesturefy/

Copy/Pate about:addons into the Address Bar then Enter Near page top right side Click the Gear Icon and update.

If that does not update them you may have reinstall them Note best to read or go to the Support Page in case they have info there.

May want this : https://mozilla.github.io/extension-finder/

Please let us know if this solved your issue or if need further assistance.

Tried updating both add-ons but they still don't work.

Colorful Tabs has its own support forum here: https://www.addongenie.com/forums/forum/colorfultabs

Are you sure it isn't just features that aren't permissible in Firefox 57? Two new versions of Colorful Tabs were released within the last week, so I would be surprised it it didn't work at all. https://addons.mozilla.org/en-US/firefox/addon/colorfultabs/versions/ On the 17th (v 32.0) and the 20th (v 32.1) of November.

I updated on both dates and the add-on still doesn't work. : ( For now, I've disabled both add-ons.

I'll try the forum. Thanks.

Okay, I installed VivaldiFox to replace ColorfulTabs and it does work but you can't change colors for individual tabs like you could with ColorfulTabs and it also turns off any themes you may have running. The previous ColorfulTabs allowed for tab color customization and themes simultaneously.