Hi, You may be able to get that functionality with third-party extensions. You can try [https://addons.mozilla.org/en-US/firefox/addon/colorfultabs/ ColorfulTabs.] [https://www.binaryturf.com/free-software/colorfultabs-for-firefox/colorfultabs-documentation-and-help/ Documentation.] Please go through the reviews, ratings, FAQs etc. before installing. There may also be other similar add-ons. To search for an add-on: '''Tools''' ('''Alt''' +'''T ''') > '''Add-ons''' and type in a term in the top right search box eg. tabs. Alternatively you can also search for add-ons at the Mozilla official (and therefore safe) site: https://addons.mozilla.org/ ............................................................................................................................... Useful links: [https://support.mozilla.com/en-US/kb/Options%20window All about Tools > Options] [http://kb.mozillazine.org/About:config Going beyond Tools > Options - about:config] [http://kb.mozillazine.org/About:config_entries about:config Entries] [https://support.mozilla.com/en-US/kb/Page%20Info%20window Page Info] Tools (Alt + T) > Page Info, Right-click > View Page Info [https://support.mozilla.com/en-US/kb/Keyboard%20shortcuts Keyboard Shortcuts] [https://support.mozilla.com/en-US/kb/Viewing%20video%20in%20Firefox%20without%20a%20plugin Viewing Video without Plugins] [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder & Files] [https://developer.mozilla.org/en/Command_Line_Options#Browser Firefox Commands] [https://support.mozilla.com/en-US/kb/Basic%20Troubleshooting Basic Troubleshooting] [https://support.mozilla.com/en-US/kb/common-questions-after-upgrading-firefox-36 After Upgrading] [https://support.mozilla.com/en-US/kb/Safe%20Mode Safe Mode] [http://kb.mozillazine.org/Problematic_extensions Problematic Extensions] [https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes Troubleshooting Extensions and Themes] [https://support.mozilla.com/en-US/kb/Troubleshooting%20plugins Troubleshooting Plugins] [http://kb.mozillazine.org/Testing_plugins Testing Plugins]

Try: *Colorful Tabs: https://addons.mozilla.org/firefox/addon/1368