In addition to the TV streaming never working since the day it rolled out initially. Comcast continues to use the flash player that most browsers have deactivated by default and can only be turned on with dire security warnings. I am pretty sure most browser makers do not plan to have any flash support for much longer. Well I long ago gave up on the streaming service it never has worked and is not likely to anytime soon. However I was using the online listings until a few minutes ago when It refused to even let me look at the listings unless I turn on the VERY HIGH security risk adobe flash player. Flash is being discontinued. It is no more. Browsers are phasing it out and supporting it less and less. Almost every security expert out there recommends against turning on flash in your browser.
if you keep updated on non-chrome adobe flash installations you might be ok. I use chrome and it has integrated sand-boxed flash that is managed by chrome.