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FlagTab is a Firefox Extension.

You can download it from the Firefox Add-Ons site.

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This extension gives you the ability to color code your tabs; making it easier to recognize which tabs are related to one another.

For example, after installing FlagTab, double-click on one of your tabs and you’ll notice that it instantly changes color:

 

 

Double-click again on the same tab, and it will change to another color:

 

 

You can choose one of four colors for each tab: Red, Blue, Green, and Yellow.

If you don’t want to double-click a tab, you can always right-click and choose a color from the context menu:

 

 

As you can see from the above screenshot, you can also remove any (or all) of the FlagTabs from the same menu.

If you like to keep lots of tabs open at the same time, you can quickly see which tabs are related to each other. For example, let’s say you color code your articles-to-read in blue, and search results in red. It would probably look similar to the screenshot below: