How to Fix the “pr_end_of_file_error” Error in Firefox

If you use Firefox and run into the “pr_end_of_file_error,” you’re not alone. This error pops up when Firefox can’t establish a secure connection to a website. The good news? You can fix it. Here’s how.

What Does “pr_end_of_file_error” Mean?

This error usually means there’s a problem with the way Firefox is trying to set up an encrypted connection (HTTPS) with a website. It could be due to browser settings, corrupt files, or issues with your security software.

Step-by-Step Fixes

1. Clear Browsing Data

Corrupted cache or cookies can cause connection issues.

• Click the three lines (menu) in the top right.
• Go to Settings > Privacy & Security.
• Scroll to Cookies and Site Data and click Clear Data.
• Restart Firefox.

2. Disable Proxy Settings

Misconfigured proxy settings can block connections.

• Type about:preferences in the address bar and press Enter.
• Scroll to Network Settings and click Settings…
• Select No proxy or Use system proxy settings.
• Click OK and restart Firefox.

3. Turn Off VPN or Security Software Temporarily

Sometimes, VPNs or antivirus software interfere with secure connections. Temporarily disable them and see if the error goes away. If it does, check your VPN or antivirus settings for HTTPS scanning and turn it off if possible.

4. Refresh or Reinstall Firefox

If none of the above works, try refreshing Firefox.

• Go to about:support in the address bar.
• Click Refresh Firefox in the upper right.
• Confirm, and Firefox will restart fresh (your bookmarks and passwords are kept).

If that fails, uninstall and reinstall Firefox from the official website.

5. Check the Website

Sometimes the problem isn’t on your end. The site itself may have misconfigured SSL settings. Try opening the website on another browser or device. If it’s down everywhere, wait for the site owner to fix it.

Final Tips

• Keep Firefox up to date.
• Only use reputable VPNs or antivirus programs.
• Don’t change advanced settings unless you know what you’re doing.

If you keep seeing the “pr_end_of_file_error,” let us know in the comments or contact Mozilla support. There’s always a solution!

Have you fixed this error before? Share your experience below!

Mark Vincent

Tech enthusiast and content creator passionate about making technology simple for everyone. I share practical tips, guides, and reviews on the latest in computers, software, and gadgets. Let’s explore the digital world together!