Is anyone else having an issue watching DVR or on-demand shows using Mozilla Firefox 55.0.3? The shows are loading to the point where it shows the network's logo and the blinking three dots underneath it. It's not timing out and there's no error code appearing. This just started yesterday (Thursday). It was working fine Wednesday. It currently works in IE 11 and Edge so I don't know that it's necessarily a Comcast issue. 55.0.3 was downloaded on 8/28/2017 and my last Adobe Flash update was 9/14/2017 so it's worked since those updates.
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Yes, I am having the same issue. It started Wednesday (9/20)
I reinstalled firefox (64 bit). It still failed until I "refreshed" firefox (Menu, help (the ?), troublshooting, and then "refresh firefox". That worked until I closed the browser. When re-opened -thre cycling dots with logo. Then I installed adobe flash. It worked all evening -tonight (9/22) -three dots...
It worked! I did a refresh on Firefox. Shockwave Flash, Widevine, and Cisco were already set to always activate. I downloaded Flash again to be sure I had the latest version. Xfinity had me re-add the laptop as a recognized device. Thanks for the tips. Much appreciated.