Cannot use XfInity streaming apps on computer - Firefox and Microsoft Edge

I was able to view video content with no issue.  Both Microsoft and Firefox disable Flash by default in the browser and force users to enable it, usually, on a per site basis.  Please ensure Flash is enabled in the browser:

• Enable Flash Player for IE on Windows 10.
• Enable Flash Player for Edge on Windows 10.
  • Troubleshooting Flash Player on Microsoft Edge
  • Extending User Control of Flash with Click-to-Run - Microsoft Edge Dev BlogMicrosoft Edge Dev Blog
• For Firefox: Why do I have to click to activate plugins? | Firefox Help

If you're still experiencing issues after enabling Flash content for the given site, please post a direct link to the problematic content.

To investigate further, please provide the following information:

• Windows 10 Version and OS Build.  See https://support.microsoft.com/en-us/help/13443/windows-which-operating-system for instructions on obtaining this information.
• Flash Player version installed:  Go to Adobe Flash Player issues with Windows 10 (Microsoft Edge) and click the 'Test Flash Player' button to obtain the Flash Player version installed on your system.

Microsoft embeds Flash Player in Edge and IE on Windows 10.  All Flash Player for IE/Edge updates are released by Microsoft via Windows updates on the 2nd Tuesday of the month. Unless Microsoft released early, there would have been no change to Flash Player on a Windows 10 system on the date you mentioned.