Antivirus software can sometimes misidentify safe websites and block your access to them. Synchronization issues between desktop and mobile browsers can corrupt a Firefox profile, triggering the Firefox secure connection failed error. In this case, the browser enforces a cipher version that’s not supported either by Firefox or the website. It may happen when you’ve modified SSL settings on your computer or browser. If not configured correctly, VPN and proxy services can trigger PR_END_OF_FILE_ERROR. A VPN and a proxy server act as a middle man between your computer and website server, hiding your IP address and location. Virtual Private Network (VPN) or proxy server interference.In general, this error has four possible causes: However, if Firefox reaches the end of the cipher suite file and doesn’t find a match, it results in the PR_END_OF_FILE_ERROR message. When you visit a website that uses SSL or TLS, the browser runs through the cipher suite until it finds a matching algorithm for the connection. Your browser has a cipher suite – a set of algorithms that makes a secure connection over an encrypted protocol possible. To understand why PR_END_OF_FILE_ERROR happens, we have to understand the process of establishing a secure connection between a browser and a website.

Thus, this often affects many websites you try to visit, as the problem is on the client-side. It is a Firefox-specific error and won’t appear in any other browser. The PR_END_OF_FILE_ERROR error message appears when the Mozilla Firefox browser can’t establish a secure connection.

Unable to download mozilla firefox mac