Since the upgrade to 34.0.5, I can no longer access the management web pages of many of our network devices. It gives an error:
Firefox cannot guarantee the safety of your data on 10.32.16.50 because it uses SSLv3, a broken security protocol.
Advanced info: ssl_error_no_cypher_overlap
I made the following changes in about:config
security.tls.version.fallback-limit (default=1, change to 0)
security.tls.version.min (default=1, change to 0)
security.ssl.enable_ocsp_stapling (default = true, change to false)
security.ssl3.* (quite a few are set to disable, enable them all)
If you see the error ssl_error_unsupported_version then do the following:
1) Type about:config in the location bar.
2) In the search bar that comes up, enter: security.tls.version.min . Double-click on the entry that comes up and change the value to 0.
3) Do the same for security.tls.version.fallback-limit .
4) Test your broken site. It should work now.
UPDATE: This does not work reliably so I’ve start using Firefox Portable as discussed here.