Review for HashColouredTabs+ by gigaherz
Rated 3 out of 5 stars
I have been using HCT+ for years, but recently I noticed one favicon that didn't appear when it should. I "upgraded" my google docs to google drive, and isntead of seeing the gdrive favion, I started seeing a HCT+ placeholder. Since I couldn't trust HCT+ not to "take over" other favicons, I had to disable it.
To create your own collections, you must have a Mozilla Add-ons account.