in background.js [143:152]
function getGWTRedirectURL(url) {
var hash = url.hash.substring(1);
var pathname = url.pathname;
if (pathname.startsWith('/c/') && parseInt(hash, 10) > 0) {
pathname += '@' + hash;
}
url.hash = '#' + pathname;
url.pathname = '';
return url.toString();
}