''locking this thread as duplicate, please continue at [https://support.mozilla.org/en-US/questions/1275239]'' This is the only problem. Other websites work as always. I could use the chat before I upgraded to 71.0. I can use the chat with Chromium browser (I had to install it to test that). I've disabled all the add-ons, allowed pop-up windows, and disabled all protections for this site. I have cleared the cache and cookies.