You can find the New Tab button showing as a '+' on the Tab bar.<br /> You can open the Customize window and drag the New Tab button that shows as a plus sign (+) from the Tab bar on another toolbar and it will become a regular toolbar button like the New Tab button that you have in Firefox 3 versions.<br /> If you can't find the New Tab button then click the "Restore Default Set" button in the Customize window.<br /> *http://kb.mozillazine.org/Toolbar_customization *https://support.mozilla.org/kb/Back+and+forward+or+other+toolbar+items+are+missing ---- Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes). *Don't make any changes on the Safe mode start window. *https://support.mozilla.org/kb/Safe+Mode