This article describes why you can get the message "Firefox can't connect securely to (site name) because the site uses an older, insecure version of the SSL protocol" when trying to go to certain secure (https) sites.
Support for SSL v2 (Secure Sockets Layer 2.0) is disabled by default. While most sites have moved to a better encryption protocol, some have not. If you access a site that only supports SSL v2, you will receive the above error in Firefox.
You should contact the owner of the site, and ask them to a support a newer encryption protocol. You can also report the site to the Firefox developers by opening the Help menu and choosing Report Broken Website....
If you must access the site, you can turn on SSL v2 support.
With SSL v2 enabled, you should now be able to access the site.
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