For anyone wanting to go to Firefox 4, but not liking the UI overhaul, I recommend the following extensions: Firefox 4 UI Fixer <https://addons.mozilla.org/en-US/firefox/addon/firefox-4-ui-fixer/> - Allows movement of the menu bar (I can't move into the Customize window to get rid of it entirely, but I moved it to my bookmarks toolbar, which I always keep hidden), adds the Firefox menu as a button (so you can have the standard title window /and/ the Fx menu), and makes status bar icons movable. Status-4-Evar <https://addons.mozilla.org/en-US/firefox/addon/status-4-evar/> - provides a place for items that use the old status bar and don't have buttons. Toolbar Buttons <https://addons.mozilla.org/en-US/firefox/addon/toolbar-buttons/> - Tons of buttons that let you have common functions available in a toolbar or the add-on bar. Firefox 4 still has UI issues (font rendering being the biggest), but the speed increase is well worth the switch.