These can explain it better than I can:

PR_END_OF_FILE_ERROR I cannot open any website at all. https://support.mozilla.org/en-US/questions/1267590

Sometimes Google and Youtube dont load: PR_END_OF_FILE_ERROR https://support.mozilla.org/en-US/questions/1267074

Also see: How to troubleshoot security error codes on secure websites https://support.mozilla.org/en-US/kb/error-codes-secure-websites

What do the security warning codes mean? https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean

My_Cheese_Is_Slippin' said

These can explain it better than I can: PR_END_OF_FILE_ERROR I cannot open any website at all. https://support.mozilla.org/en-US/questions/1267590 Sometimes Google and Youtube dont load: PR_END_OF_FILE_ERROR https://support.mozilla.org/en-US/questions/1267074 Also see: How to troubleshoot security error codes on secure websites https://support.mozilla.org/en-US/kb/error-codes-secure-websites What do the security warning codes mean? https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean

Hi Cheese,

None of those links say **specifically** what this error means. The closest one is the second link you posted, but unfortunately it is still generic to SSL error messages, rather than this **specific** SSL error message.

Thanks, -Aaron

From: Sometimes Google and Youtube dont load: PR_END_OF_FILE_ERROR https://support.mozilla.org/en-US/questions/1267074

@cor-el said:

"This means that Firefox wasn't able to establish e secure connection and that all cipher suites failed (i.e. Firefox reached the end of the list). This can happen if you use a proxy or VPN or have other software that intercepts the connection and act like a man-in-the-middle."