Do not blame the author .. blame those that developed Quantum. They favour the need for speed as opposed to HOW the browser is used. I doubt very much that they even looked at how folks used the browser in conjunction with the best add ons. BOOO to Firefox makers which has made the addon virtually impossible to use.

Oh .. with the automatic downloads they kidnapped loads of unsuspecting punters giving them no choice .. but you can revert to an older version of Firefox (ESR) which will have security updates. The more that do it .. the more they will see they need to work on API.

You could also try waterfox which allows the use of Colourful tabs. For a lot of long term users its function over electric speed. Colourful tabs Version 31.2.2 works with waterfox.