When I access chat.google.com and attempt to play a video that is uploaded to chat, it will not play. The built in player opens with a red play button but clicked it does nothing. These videos used to work up until sometime earlier this year. Most of the videos are uploads from someone's phone and they appear to be mp4. I've tried private windows, removing firefox along with all program data and profiles and starting with a clean slate with no luck. Other browsers play the videos fine, just not firefox. Attempting to play videos that used to work no longer work. Suggestions?