Mozilla Firefox Error Code PR_END_OF_FILE_ERROR: How to Fix It

Easy 10-20 minutes Medium Severity Verified June 2026
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Error Code
PR_END_OF_FILE_ERROR
Brand
Mozilla Firefox
Product Type
browser
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
10-20 minutes
The Firefox PR_END_OF_FILE_ERROR occurs when your browser's connection to a website is unexpectedly interrupted during the TLS handshake process. This usually happens due to network issues, security software interference, or corrupted browser data preventing secure connections from establishing properly.
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Tools You'll Need

How to Fix Error Code PR_END_OF_FILE_ERROR

  1. Refresh the page and check your internet connection

  2. Disable browser extensions temporarily

  3. Clear Firefox cache and cookies

    Clearing cookies will log you out of websites and remove saved preferences

  4. Reset Firefox security settings

    Modifying security settings may reduce protection - revert changes if issues persist

  5. Temporarily disable antivirus and firewall

    Remember to re-enable your security software after testing

  6. Update Firefox to the latest version

  7. Create a new Firefox profile

    A new profile will not have your bookmarks, passwords, or extensions

  8. Check system date and time

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When to Call a Professional

Contact your internet service provider if the error persists across all browsers and devices, as this indicates a network infrastructure issue. If you're on a corporate network, contact your IT department as the issue may be related to proxy settings or enterprise security policies.

Frequently Asked Questions

What does PR_END_OF_FILE_ERROR mean in Firefox?
PR_END_OF_FILE_ERROR means Firefox's connection to a website was unexpectedly terminated during the TLS handshake process, preventing a secure connection from being established.
Why do I only get this error on certain websites?
Some websites may use specific TLS configurations or security protocols that conflict with your Firefox settings, antivirus software, or network configuration. The error typically affects HTTPS sites more than HTTP sites.
Can antivirus software cause PR_END_OF_FILE_ERROR?
Yes, antivirus programs that scan SSL/TLS traffic can interfere with secure connections, causing this error. Temporarily disabling web protection or adding Firefox to the exceptions list often resolves the issue.
Will clearing Firefox data delete my bookmarks?
Clearing cache and cookies won't delete bookmarks, but creating a new profile will. Before creating a new profile, sync your bookmarks with Firefox Sync or export them to a file for backup.
Is PR_END_OF_FILE_ERROR dangerous?
The error itself isn't dangerous - it simply prevents you from accessing certain websites. However, avoid disabling security features permanently, as this can make your browsing less secure.

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