I love this add on but it is USELESS in FF57 onwards, I will give 5* when you make it work properly in >57

When I tried in 57 it coloured the whole of top of screen not just the tab, made it useless.

The other thing I use this for is nice straight tabs not those crappy onces FF copied from Chrome.

I have kept my Firefox at 56.02, the last edition where this works with V30.02 as advised by others below (GREAT SUGGESTION)

It is one of three add-ons whose utility is worth more to me than FF57 Quantum.

So PLEASE developer, get it working with 57 or explain why you can't on your description