Make Active Tab Wider

Make the active tab wider than all other tabs.

Compatibility

Works with: Firefox 3.6 ONLY

Background

Normally all the browser tabs are the same width. Depending on the number of tabs currently open it can be difficult to determine which tab is the active tab.

The Tweak

To make the active tab wider than all other tabs, you will need modify your userChrome.css. Add these lines to your userChrome.css file located in your profile folder:

 /* Make the active tab wider */
 #content tab[selected="true"] {
 min-width: 200px !important;
 }

Notes:

• Any value may be substitute for the ‘200px’.
• Once these lines are added, click Save, then Restart.

Original Article

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Updated: November 15, 2025