I found the fix for this and want to share, as it's really annoying. CWTV worked fine with IE11 or Chrome with the AdBlock Plus filters @@||cwtv.com^$document @@||cwtv.com^$elemhide and @@||partner.googleadservices.com/gpt/pubads_impl_*.jsdomain=cwtv.com but failed with Firefox. Using the F12 console, I saw that my request to watch a show was being rejected because "do not track" was enabled. I knew this wasn't right, so I checked FF options, and sure enough, it was not checked. I then used configuration mania to look at the Security/Privacy section, and "Enable Tracking Protection" showed being checked there. I unchecked it and hit Ctrl F5 in the CWTV window and BAZAAM! Episode started playing. I spent a few hours poking around until I found this, but it's worth it not to have to switch browsers to stream CWTV.