rem: BrowserBack(); 
add: switch (gPrefService.getIntPref("browser.backspace_action")) { case 0: BrowserBack(); break; case 1: goDoCommand("cmd_scrollPageUp"); break; } 
context: function BrowserHandleBackspace(){  BrowserBack();}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/0120c195b5602ba8b8f37841d80655f6ea123bfb/browser.js/clean/browser/base/content/browser.js