SVG files are supported by all browsers so need to support it as well, according to https://www.w3schools.com/html/html_favicon.asp Also, it appears as SEO.com site, which was dropped because of a cert issue, has only SVG icon. So enabled it again. Lastly, from python 3.2, `os.path.samefile` is supported on Windows. So Windows will now test TrackerIcons as well.