You should find an answer in the article linked below (remove the blank space). https://appuals. com/pr-end-of-file-error/

Hello Terry, I tried everything on the website you pointed me to and I am still having the same problem. I deleted and reinstalled firefox 2 more times to no avail. Same problem. Again this started happening after firefox did an automatic update. I believe that update has something to do with this problem.

You can try to disable DNS over HTTPS. *https://support.mozilla.org/en-US/kb/firefox-dns-over-https *https://support.mozilla.org/en-US/kb/dns-over-https-doh-faqs Are you using a proxy or VPN? You can check the connection settings. *Settings -> General -> Network: Connection -> Settings If you do not need to use a proxy to connect to internet, select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly. See "Firefox connection settings": *https://support.mozilla.org/en-US/kb/websites-dont-load-troubleshoot-and-fix-errors *https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can *https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems. *https://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/ *[https://www.digitalcitizen.life/4-ways-boot-safe-mode-windows-10/]