add:  var promptService = Components.classes["@mozilla.org/embedcomp/prompt-service;1"].getService(Components.interfaces.nsIPromptService); var promptTitle   = gNavigatorBundle.getString("wallpaperConfirmTitle"); var promptMsg     = gNavigatorBundle.getString("wallpaperConfirmMsg");  var buttonPressed = promptService.confirmEx(window, promptTitle, promptMsg, (promptService.BUTTON_TITLE_IS_STRING * promptService.BUTTON_POS_0) + (promptService.BUTTON_TITLE_CANCEL    * promptService.BUTTON_POS_1), promptTitle, null, null, null, {value:0});  if (buttonPressed != 0) return;  
context:     setWallpaper: function() {      var winhooks = Components.classes[ "@mozilla.org/winhooks;1" ].                       getService(Components.interfaces.nsIWindowsHooks);            winhooks.setImageAsWallpaper(this.target, false);    },    
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/8008897e8bf0fe657999ed9dc39f8b3941633085/browser.js/buggy/browser/base/content/browser.js