Ran via devtools console to extract google mobile friendly tool's complete blocked/failed resource URIs (from the results page)

gmft-console-dump-uris.js

var jq = document.createElement('script');
jq.src = 'https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js';
document.getElementsByTagName('head')[0].appendChild(jq);

setTimeout(function(){
    jQuery.noConflict();

    var lists = jQuery('.url-list');
    lists.each(function(i,el) {
        var $lis = jQuery(el).find('li');
        $lis.each(function(i, li) {
            console.log($(li).attr('title'));
        });
    });

}, 500);