In firefox 3, you had a way of defining parameters by changing the file Mozilla Firefox\defaults\pref\firefox.js. I allways set pref("browser.tabs.tabMinWidth", 20); pref("browser.tabs.closeButtons", 3); pref("browser.tabs.insertRelatedAfterCurrent", false); as this is how I like to work (I sometimes open LOTS of tabs to search for something) How do I do this in firefox 4 ? I have searched, but cant find an answer I reinstalled 3.6.15 at once, when I couldnt find the answer and plan to stay on 3.6 until I can get this to work. Otherwise firefox is brilliant, keep up the good work.