We run a Citrix shared desktop image with Windows 2008 R2 at the core and Citrix on top of it. We upgraded from Firefox 54 on one server and 56 on another server to the latest release of ver 57 Firefox Quantum. After the install we are no longer able to browse any websites in Firefox. IE and Chrome browse just fine so core networking is fine. Firefox Quantum ver 57 will not load any sites. Tried to clear the profile and re-create it and still had an issue. I created a new user as a test to see if that user getting a totally new profile would have the same issue and it did. Firefox never tries to open the website, its tab just sits there moving the new dot back and forth like it is trying to connect and it never does, you never see a page try to load per attached screen shot. Tried setting Firefox as default browser and still had same issue. A link that was created in Chrome and works with Chrome or IE never launches when Firefox is the default.

I went back to ver 56 on another test server and it is working fine. But then I upgrade it to Firefox Quantum and it breaks and has the same issue as above. I can't get Quantum to run in any of our Citrix published desktops or Citrix VDI environment.