GM_xmlhttpRequest( { "method":"GET", "url":url, "onload":callbackForSuccess, "onerror":callbackForError, "headers":{ "Content-Type":"text/plain", "Accept-Charset":"x-user-defined" "If-Unmodified-Since":lastModified, "Range":"bytes="+from+"-"+To } } ); GM_xmlhttpRequest( { "method":"GET", "url":url, "onload":callbackForSuccess, "onerror":callbackForError, "headers":{ "Content-Type":"text/plain", "A