It is possible that you are still on the beta update channel if you ever installed a Firefox 4 beta version or a release candidate. You can check that by looking at the pref <b>app.update.channel</b> on the about:config page.<br /> To open the <i>about:config</i> page, type <b>about:config</b> in the location (address) bar and press the "<i>Enter</i>" key, just like you type the url of a website to open a website.<br /> If you see a warning then you can confirm that you want to access that page.<br /> You can use the Filter bar at to top of the about:config page to locate a pref more easily. If the value of that pref is beta then it is better to download and install the latest Firefox 4.0.x release. * http://www.mozilla.com/en-US/firefox/all.html