I installed Firefox 52.5 (Firefox Extended Support Release (ESR)) and it says, when adding Colorful Tabs through Tools/Add-Ons, "This add-on requires a newer version of Firefox (at least version 57.0). You are using Firefox 52.0."
When I start from https://www.addongenie.com/ I get a pop=up from the left of the URL stating "Firefox prevented this site from asking you to install software on your computer". When pressing "allow" it says "Firefox has prevented this site from installing an unverified add-on", and takes me to https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox?as=u&utm_source=inproduct
I will follow this as long as I have the patience but would prefer to have a direct link to the correct version of CT for ESR. Thanks so much for struggling through with this!
Before I switched from Firefox 57 I was sure this forum had a link for adding the right version of CT to ESR but now I can't find it.
And duh, I lost all my open tabs on 3 pages of Firefox, moving too fast.