Safari 13.1, which uses Adobe Flash(most current version in use, Xfinity is only stream that requires me to use Flash). If I open Safari, go to Xfinity Stream, and then open another tab in Safari, do anything etc, go back to stream, it refreshes after about 2 seconds with no input other that getting the fous on the streaming tab. Spoke with Apple support. Not a known issue. My Macbook Pro version of Catalina is 10.15.4. This worked as I would expect prior to an auto update on Catalina. As a course of troubleshooting, I tried on my new IMac, Catalina 10.15.3 with the exact procedure of, open Xfinity Stream, open another Safari tab, read whatever, go back to Xfinity Stream, no issue. Does not affect other streaming sites in Safari. Ok so i went a step further and loaded Firefox. No issue. Apple is making engineering aware. Has Xfinity seen this too? It is like it has to re-establish a connection with login info for a page/tab already running. Just an annoyance, and I want to use the native Safari over any other browser.
I have been wondering for over 3 years now about this.
I noticed when I updated to macOS 10.13 I started getting broken code sent to Safari (seems like the site reads 10.13+ as 10.1 and so a 480 video hits the CPU hard when I can stream a 1080 video on anohter site and the CPU usage is under 8%. Chrome gets lets Chrome code but when I try to mask as Chrome there seems to be Chroimum only coding rather than the feature detction they should be using.
I have to force the video playe to use low quality so I don't hear the fans due to the old code on the site. I looked at some of the site code and it is browser sniffing for Netscape or Windows 3.11 amoung others. Still see the same bug in 10.15.x I have have reported it to Comcast mulipule times, sent photos and videos of the bug and still not been fixed. Other browsers are getting a HTML 5 video player and Safari is stuck with a video player that runs like Flash Player on Mac OS X from 2003 performance (extremely bad).
I have also let Apple know.
Same issue. Only started today as streaming was functional yesterday. No Apple updates installed within that time frame. Error TVAPP-00210
Customer Service Diagnostics
Build number 9
OS Mac OS 10.14.5
Browser Safari 12.1.1
Flash version 32.0.0
Status in home
Entitlements clinear, tve-vod, cvod, tve-linear, est, transactions
Last fingerprint cloudtv_web_polymer_5.19.1_prod_1589XXXXXXXXX_XXXX
Stream provider primetime
Note: I cleared my History but that didn't seem to work, so I decided to check out preferences.
This worked for me:
1. Go to the Safari menu (top left) and select "Preferences..".
2. Click on the "Advanced" tab.
3. Deselect (uncheck) "Stop plug-ins to save power"
4. Make sure that Xfinity.com is set to on in the Websites tab, for the Adobe Flash Player. (update Adobe Flash Player if it hasnt been updated in a while -- I did not update mine v32....
5. Restart Safari; and go check the streaming for your channels.