Did this just start in Firefox 100? One of the new features mentioned in the Release Notes is:

Picture-in-Picture now also supports video captions on websites that use WebVTT (Web Video Text Track) format, like Coursera.org, Canadian Broadcasting Corporation, and many more.

Are you seeing the problem in the PiP window, or in the regular player?

this is the whole error

XML Parsing Error: undefined entity Location: https:facebook.com/watch?v=473156311232351 Line Number 15, column 43

Do not know if this their way of putting some one in jail or not. I was sharing a video off of NewsMax web site and it started there.

Do not know the answers to any of your ????

Thank you Linda

Hi Linda, I meant PiP = Picture-in-Picture, a video player window you can pop out of the normal video location using a specific icon: About Picture-in-Picture in Firefox. Is the problem in a PiP window, or on the regular player in the page?

I'm not sure what details FB pulls in when you grab a video from another site. Maybe there is another way to share the video which doesn't cause this issue. ??

Are you using a language pack or another Firefox locale or a theme that is possibly broken ?

• https://support.mozilla.org/en-US/kb/use-firefox-another-language

You can check if there are updates for your Add-ons.

• https://support.mozilla.org/en-US/kb/how-update-add-ons
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems