I don’t know why it doesn’t work to edit the tab width by editing the following two preferences in about:config in Firefox 4 Beta 4:
browser.tabs.tabMaxWidth
browser.tabs.tabMinWidth
But I found the add-on Custom Tab Width that does the job! The strange thing is that it looks like the add-on changes those two preferences, and that apparently works. I guess that the add-on edits something more… But it works!
