We have selected the option Register certificate for https connection from the project settings and we try to run performance testing against https web application. Expected behavior: The test is executed successfully in all browsers. Actual behavior: The test is executed successfully in Chrome, IE and Safari. In Firefox 26 the test fails because an error message "This Connection is Untrusted" is shown. In the technical details we can see: www.xxxxx.com uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer). Steps to reproduce and a sample test project are attached in the internal description.