Samples do not work in Firefox because of an insecure connection

Problem

Firefox reports 'Your connection is not secure'

Solution

Verified in Firefox Quantum (version 61).

STU SigCaptX requires access to https://localhost:9000 by default. It is possible to configure a different port number, but this doesn't cure the problem described below.

Firefox considers the attempted connection to localhost to be a security breach and refuses to allow it.

In order to remedy this it is necessary to add a security exception to Firefox as described below.

1. Navigate to https://localhost:9000 in the Firefox browser.
2. An error message should appear saying that the connection is not secure because the owner of localhost has not configured their Web site properly (see below).
3. Click on the button labelled "Add Exception..." at the bottom of the error page.
4. When the "Add Security Exception" dialogue box appears it should be auto-populated with the localhost port number so click on the "Confirm Security Exception" button at the bottom of the window (see below right).
5. Close and restart Firefox.