What do the SSLv3 error messages mean on Firefox?

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  • Creator: philipp
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  • Reviewed by: ideato
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Firefox versions 33 and lower: This article applies to newer versions of Firefox. If you are unable to use a newer version, install this official Mozilla add-on to disable SSLv3 immediately.

Starting with Firefox 34, Firefox will block Secure Sockets Layer version 3.0 (SSLv3) to protect your information from attacks. SSLv3 is a type of technology that some websites use to connect to a server. It is no longer secure, which makes it easy for hackers to extract your personal information during a connection. For more information, see this blog post.

What happens when you access vulnerable sites

When you access a site that only supports SSLv3, Firefox will block it and display this message: "Unable to connect securely". If you see this message, please contact the website owner to let them know about the problem.

Additional precautions

To further protect yourself from attacks, keep Firefox up to date. The simplest way to do this is to set up automatic updates:

  1. Click on the menu button The image "new fx menu" does not exist., then click OptionsPreferences.
  2. Click the Advanced panel, then click the Update tab, and make sure that Automatically install updates is checked.

If you use your Linux distribution's packaged version of Firefox, there will be no Update tab in the panel. Instead, Firefox updates are managed by the Update Manager for your distribution, and any updates should be installed automatically.