rem: var cacheService = Components.classes['@mozilla.org/network/cache;1?name=manager'] .getService(nsINetDataCacheManager); cacheService.clear(aType); 
add: var classID = Components.classes["@mozilla.org/network/cache-service;1"]; var cacheService = classID.getService(Components.interfaces.nsICacheService); cacheService.evictEntries(aType); 
context: function prefClearCache(aType){  var cacheService = Components.classes['@mozilla.org/network/cache;1?name=manager']                               .getService(nsINetDataCacheManager);  cacheService.clear(aType);}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/525851d1cf5302dd39bc97896ce9e6fa0ae81df7/pref-cache.js/clean/xpfe/components/prefwindow/resources/content/pref-cache.js