That doesn't sound like a firefox browser issue but site issue. Did you contact them about this?

This is what I get on the link in reply back.

Did Not Connect: Potential Security Issue

Firefox detected a potential security threat and did not continue to files.cloudera.com because this website requires a secure connection.

Did Not Connect: Potential Security Issue

Firefox detected a potential security threat and did not continue to files. cloudera. com because this website requires a secure connection.