Great but..... Rated 4 out of 5 stars
In maintaining unique colors for different domains, it does a better job than the Colorful tab addon.
Hope the efficiency and usage of this addon can be improved in future.
There are several concerns about this addon:
1. When used with TMP, when switching back to last browsed tab upon closing current tab, the color of the tab switched back doesn't become deep again.
2. When there are tabs opened by the application of other addons like Easy drag to go, the new tab doesn't become colored.
Colorful Tabs doesn't have these problems.
Anyway, this addon is great. Hope it can become more versatile in future.