rem: var cache = Components.classes['@mozilla.org/network/cache;1?name=manager'].getService(); var cacheService = cache.QueryInterface( Components.interfaces.nsINetDataCacheManager); cacheService.clear( 12 ); 
add: prefClearCache(nsINetDataCacheManager.FILE_CACHE | nsINetDataCacheManager.FLAT_CACHE); 
context: function prefClearDiskCache(){  var cache = Components.classes['@mozilla.org/network/cache;1?name=manager'].getService();  var cacheService = cache.QueryInterface( Components.interfaces.nsINetDataCacheManager);  cacheService.clear( 12 );}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/123bc557af92aa597ec961d7c645c6c5659043ed/pref-cache.js/clean/xpfe/components/prefwindow/resources/content/pref-cache.js