First, export the StresStimulus certificate. In the StresStimulus main menu, go to Options > HTTPS... to open the HTTPS options dialog.
Click the Export Root Certificate button, and in the save file dialog, provide the location where you want to save the certificate.
In Firefox go to Tools > Options > Advanced. Select the Certificates tab. Click the View Certificates button. Go to the Authorities tab.
Click the Import button and provide the saved certificate's location.
To enable HTTPS in Firefox for Fiddler, refer to this link http://docs.telerik.com/fiddler/configure-fiddler/tasks/firefoxhttps.
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