main.js

var a = document.getElementsByClassName("post-wrapper");
var str_links = "";
for( var i = 0; i < a.length; i++ )
{
    if( a[i].childNodes[1].childNodes[1].childNodes[1].checked )
    {
        var pics = a[i].getElementsByTagName('a');
        
        for( var j = 0; j < pics.length; j++ )
        {
            if( pics[j].href.indexOf( "jpg" ) !== -1 ||
                pics[j].href.indexOf( "png" ) !== -1 ||
                pics[j].href.indexOf( "mp4" ) !== -1 ||
                pics[j].href.indexOf( "gif" ) !== -1 ||
                pics[j].href.indexOf( "webm" ) !== -1 )
            {
                str_links += pics[j].href;
                str_links += "\n";
            }
        }
    }
}




//read text from textbox placed in parent window
var text = str_links;

var textFile = null, makeTextFile = function (text)
{
    var data = new Blob([text], {type: 'text/plain'});

    // If we are replacing a previously generated file we need to
    // manually revoke the object URL to avoid memory leaks.
    if (textFile !== null)
    {
        window.URL.revokeObjectURL(textFile);
    }

    textFile = window.URL.createObjectURL(data);

    // returns a URL you can use as a href
    return textFile;
};
  
  
var pathArray = window.location.pathname.split( '/' );

var fileName = pathArray[1] + pathArray[3].split(".")[0];
var url = makeTextFile( text );
var a = document.createElement("a");
document.body.appendChild(a);
a.style = "display: none";
a.href = url;
a.download = fileName + ".txt";
a.click();
window.URL.revokeObjectURL(url);
document.body.removeChild(a);