I use firefox as my main browser and comcast infinity news videos would not play....just a black box.
The videos would play fine in the google chrome browser so i assumed that the problem lay with firefox and not with comcast.
I solved the problem by disabling the 'tracker"option in firefox tools
Go to the menu button (3 bars on the top far right of the screen)
click privacy and security
scroll to tracking protection and click "never"
That solved the problem
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