ChromaTabs

ChromaTabs livens up your browser by adding colors to your tabs. It will generate random colors for different tabs by you have unique colors for a specific site name.

The options menu lets you tweak the color settings like opacity, saturation and luminosity, but you'll have to play around with it before you find the settings that you like.

Some colors, like green, tend to repeat themselves if you have more than 5 tabs open, and the profusion of colors can end up being more confusing than anything.