rem: return permissionmanager.testPermission(uri, "image"); 
add: return permissionmanager.testPermission(uri, "image") == nsIPermissionManager.DENY_ACTION; 
context:     isImageBlocked : function() {      var nsIPermissionManager = Components.interfaces.nsIPermissionManager;      var permissionmanager =        Components.classes["@mozilla.org/permissionmanager;1"]          .getService(Components.interfaces.nsIPermissionManager);      var uri = Components.classes["@mozilla.org/network/standard-url;1"]                          .createInstance(Components.interfaces.nsIURI);      uri.spec = this.imageURL;       return permissionmanager.testPermission(uri, "image");    },
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/056f02d1f07f5c03e1a2a2d4be9a634e75360b4a/browser.js/buggy/browser/base/content/browser.js