Security fix. Fixed an accessibility regression in reader mode (bug 1650922) Made the address bar more resilient to data corruption in the user profile (bug 1649981) Fixed a regression opening certain external applications (bug 1650162)

https://www.neowin.net/news/firefox-7802/

I know that 78.0.2 was a security but why has it broken my access to this site? The suggestion from the error message is that it is preventing javascript from executing properly.