Sorry, not the best theme, as it is hard to see which tab is active. ¯\_(ツ)_/¯

I have tried a lot of themes here, but I always come back to this one. Dark, simple and nice. Wish it would be updated for vertical tabs as well.

Please add a lighter outline (maybe 1px #808080 or brighter) on active tab, because I don't have AMOLED, and I can barely see the grey outline. That's the only reason I'm not using this dope theme. I'm using Black by XI at the moment because I like that strong contrast.

The best looking theme. However if you have a laptop, I would avoid it, as firefox uses 1,5 times more resources. Sometimes it uses twice as much CPU when this theme is active.

This is my default theme and I love it! My only issue is that it's not very obvious which tab is currently in focus. If you could change that and make it a little more obvious (a lighter shade), then it would be 5 stars :D