F1,Close Tab,BrowserCloseTabOrWindow();
F2,Find,gFindBar.onFindCommand();
F3,Previous Tab,gBrowser.mTabContainer.advanceSelectedTab(-1,true);
F4,Next Tab,gBrowser.mTabContainer.advanceSelectedTab(1,true);
F5,Reload (override cache),BrowserReloadSkipCache();
F6,Select Address Bar,openLocation();
F7,Undo Close Tab,undoCloseTab();
F8,New Tab,BrowserOpenTab();
F9,Back,BrowserBack();
F10,Forward,BrowserForward();
F11,Full Screen,BrowserFullScreen();

disable in about:config
accessibility.browsewithcaret
accessibility.warn_on_browsewithcaret