Can you try refreshing Firefox? Type in the address bar "refresh" and the button to refresh Firefox should appear.

Thank you for the suggestion. I did refresh Firefox on both my desk top and lap top to no avail. I have used Firefox for years without any problem so I'm really baffled. Is there any chance my modem has something to do with it?

(Please keep the relevant info in your original question, as this makes it harder for folks to follow along meaningfully.)

Your crashes are rather unique. There's about three dozen users affected, across platforms, GPUs, CPUs without anything specific in common. There was an edge–case bug fixed for this signature few months ago for OPUS codec. This actually might be a site issue, in case they provide wrong or missing timeline info — or maybe in case your connection is spotty, the buffering might run into an edge case that looks like the stream has no duration or something? Just guessing.

Would be interesting to compare if you connect e.g. via a mobile internet hotspot or some other connection than your current one if the same happens, if you're able to replicate that regularly.