Sounds like the certificate has not been added to the store to allow SSL scanning.
You can either turn off ssl scanning or reinstall the cert
Settings > Internet Downloads
Switch off Monitor HTTPS/SSL
or
Settings > Internet Downloads > Advanced button
HTTP > Reinstall Firefox HTTPS Monitor
Here are some FAQ's that may help as well
http://support.jaksta.com/solution/articles/6000040020-https-ssl-scanning
HTH
I could not follow the instructions and don't see the tabs/options you referred to. Attached wit what I see under exceptions. Could not find "HTTP Tab and click the Reinstall Firefox HTTPS monitor"
In the Jaksta Media Recorder settings James - not in the FF settings.
James Davisd
When "Start" recording is on, then in Firefox Portable (beta) all links become untrusted "Get me out of here" warnings.