The Chrome Extension: Simple Video Download Helper is available on Chrome Webstore. The number of current users exceeds 10000 (Hurrray!)
It is fully open source on Github: https://github.com/DoctorLai/VideoDownloadHelper

New Features

As suggested by my friend, I have added a function allowing users to extract a list of images in the current page.

This commits

For example, when users presses the image button, a list of image sources are listed.

Source

  $("#pic").click(function() {
      let domain = pageurl.replace('http://','').replace('https://','').replace('www.','').split(/[/?#]/)[0];
      if (pageurl.startsWith("http://")) {
        domain = "http://" + domain;
      } else if (pageurl.startsWith("https://")) {
        domain = "https://" + domain;
      }
      $.ajax({
         type: "GET",
         url: pageurl,
         success: function(data) {
            var tmp = [];
            var re = /]*?src\s*=\s*['\"]([^'\"]*?)['\"][^>]*?>/ig;
            var found = re.exec(data);
            while (found != null) {
                var tmp_url = found[1];
                if ((tmp_url != null) && (tmp_url.length > 0)) {
                  if (tmp_url.startsWith("http://") || tmp_url.startsWith("https://")) {
                    tmp.push(tmp_url);
                  } else {
                    if (tmp_url[0] == '/') {
                      tmp.push(domain + tmp_url);
                    } else {
                      tmp.push(domain + '/' + tmp_url);
                    }
                  }
                }
                found = re.exec(data);
            }
            if (tmp.length > 0) {
              let s;
              if (document.getElementById("lang").selectedIndex == 0) {
                s = '
Images List
';
              } else {
                s = '
图片列表
';
              }
              s += "
";
              for (let i = 0; i < tmp.length; ++ i) {
                s += "
" + tmp[i] + "";
              }
              s += "";
              $('div#down').html(s);
            }    
         },
         error: function(request, status, error) {
         },
         complete: function(data) {                        
         }             
      });     
  });  

How to Contribute

1. Fork it!
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -am 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request :D