Useful during testing.

I really like the idea and it is really nice and appealing and helps you recognize which site you're on. What would be even more awesome is if you could set themes for each environment and also that I don't have to use the default theme for my default theme :D

good one to be with

Absolutely amazing addon :)

Simple, does what it says on the box, and is already helping me to not mess things up!

Amazing! Great regex support!

Cool. Saves me from doing dump things

This is a great idea and it's working as expected so far.

Lightweight and simple. Visually identifies environments for worry free testing/development.

I didn't know I was looking for it until I saw it!

This is simply awesome!

This extension can be used in another way: set your environment as keywords surrounded with asterisks such as *mozilla* or *addons* and then you can quickly guess the topic of an active tab by looking at the theme color :-)