Firefox gives me the following error:
www.paypal.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. (Error code: sec_error_unknown_issuer)
When this kind of error occured in the past, I was able to add an exception, but that option isn't there.
I've tried to find what setting in FF causes this, but have been unable to. Doing a google search gives me lots of results, but no solutions.
IE7 opens the same sites without problems.