Absolutely FANTASTIC

Great Extension!! :) It helps very much, to differentiate when developing in multi-level environments, like Local, Dev, Test, and PRO.

I really like this extension and I've been using it for years. A lot changed because of how FF changed. I would love to see inactive tabs colored again but hey I still find it useful even without that! Thank you!

Highly appreciate the developers' effort. The concept is good and very useful. But it seems like a lot of preferences options are removed in current version compared to old ones.