Shivanand, I love Colorful Tabs, but with all the new Firefox changes, it is wiggin' out on me! I understood that it would be only one color, the tab chosen, but now it is also changing my entire browser window and I cannot see the cycling theme I love. When I disable Colorful Tabs, the theme is normal. Hope that helps with any bugs and thank you for your work!
PS I can send screenshots if you need.