"Visualize page" makes many unencrypted requests to wrong sites

[123quhiwiwk]

When using the visualize page feature the addon tries to download the favicons of the sites.
But requests are sent to non-existent/other sites. And it tries to load the icon unencrypted via HTTP.
For example to http://www.com/favicon.ico and https://com/favicon.ico, see the following image:

The problem seems to be this line, as it does not work as expected when the site uses no subdomain or with TLDs like ".co.uk".

disconnect/firefox/content/disconnect.safariextension/opera/chrome/scripts/vendor/favicon/favicon.js

Line 56 in 0482e3a

var domain = url.slice(url.indexOf('.') + 1);

The cause for HTTP loading and both requests to www.com and com are these lines:

disconnect/firefox/content/disconnect.safariextension/opera/chrome/scripts/vendor/favicon/favicon.js

Lines 84 to 85 in 0482e3a

	var protocols = ['http://'];
	var subdomains = ['', 'www.'];