Colored Tabs with the "Colorful Tabs"
The Add-On "Colorful Tabs" colors of your open Tabs by accident. If necessary, you can even make only certain Tabs colorful or according to Domains sort.
- Download the free extension here , download and unzip the file.
- You install the Add-On by the .xpi file via "file" > "file" on the insert to open. Detailed instructions on how to do this, you will find here.
- Then click in the dialog window, click "install Now".
- After you have launched your web Browser, your Tabs in color.
- Tip: All of the above setting options, see "tools" > "extensions" > "Colorful Tabs" > "settings"

Colorful Tabs in Firefox
More useful Firefox Plugins you can find here.
