When I install my computer, I like to set the tabs minimum width to a smaller value via the about:config page. I've noticed that this no longer works (I'm on 8.0), although the setting still exists. Shouldn't this still work?

How can I make the tabs narrower than they presently are?

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4 Answers 4


Depreciated FF 4.0

This pref has been removed as part of the Firefox 4.0 theme work. Users can now specify the tab width using css via UserChrome.css or use the Custom Tab Width extension.


You can look into defining it by UserChrome.css here

Or just download the extension from the addons site here

  • Thank you, I will grab the extension you suggest! I was not aware of the deprecated status, and I don't get why it's still in the about:config then... Dec 6, 2011 at 7:47
  • I don't think its in there anymore (I don't have it in mine) Perhaps its still there from when you modified it in an earlier version and the settings were kept between upgrades
    – arcyqwerty
    Dec 7, 2011 at 2:28
  • Ah yes, it may be a remnant from an upgrade. I'll check on my newly installed machine at home. Dec 7, 2011 at 8:58

For userChrome.css, add:

  max-width: 150px !important;
  min-width: 10px !important;
 max-width: 1px !important;
 min-width: 1px !important;
 max-width: 1px;
 min-width: 1px;

If you use the Stylish extension, you can use that to configure the tab width. There's a already a user style which does that really well: http://userstyles.org/styles/53019/firefox-5-minimal-browser-tab-width


As of Firefox 71.0 (from January 2020), the browser.tabs.tabMinWidth config setting still exists and still works. You can edit it after entering about:config into the URL bar.

So maybe the depreciation warning about this config setting is itself outdated.

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