Where and what versions of Firefox may I find downloads without this conflict? Nice try at guessing the browser on this machine but it must be apparent that this is not the Firefox version or operating system on this machine that has the issue of security certificate validation as if it did Firefox would have prevented connection to support.mozilla.org because according to some Firefox versions support.mozilla.org does not have a valid security certificate. The system where the security issue became problematic was Windows 7 running a Firefox 62.0.2 (64 bit) version downloaded September 22, 2018 with Windows Internet Explorer. So 62.0.2 has a problem with Google and Mozilla when attempting a Download Helper plug-in download thru Firefox 62.0.2. The version on this machine is Version 59.0.2 (64 bit) for Lunix Mint. Just looking for a work around. Sorry no data it's on another machine with a Firefox browser version that prevents connection to support.mozilla.org.