I installed Firefox 4 today. It’s not in Ubuntu’s repository yet, but you can get it from a mozilla repository:

$ sudo add-apt-repository ppa:mozillateam/firefox-stable $ sudo apt-get update $ sudo apt-get install firefox

Hurray!

browser.tabs.tabMinWidth has been removed in favor of making people write a userChrome.css file. Create userChrome.css in ~/.mozilla/firefox/{profilename}/chrome. ({profilename} is a random string followed by a dot and the visible profile name. If you have multiple profiles, make sure you’re inside the right one.) There should already be a userChrome-example.css file in there. Your userChrome.css file should look like this:

`
@namespace url(“http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

.tabbrowser-tab:not([pinned]) {
  min-width: 40px !important;
  max-width: 250px !important;
}
`

(If the @namespace part gets wrapped, make sure it’s a single line.)

Set min-width and max-width to whatever you want. The defaults are 140px and 250px, respectively. Just adding that breaks tab resizing when closing windows, though, unless you disable animation. Open the magic about:config URL, find browser.tabs.animate, and set it to false.

Restart firefox for changes to take effect.

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