Firefox HTTPS Error with Custom Proxy

PROBLEM

I receive the following error when executing a test against an HTTPS site using Firefox configured with a custom proxy:

This Connection is Untrusted.
You have asked Firefox to connect securely to www.domain.com, but we can't confirm that your connection is secure.

SOLUTION

1.  Register the certificate for HTTPS Connection.

a. Follow the instructions here.

2.  Export the Fiddler Root Certificate.

a. Open Fiddler.

b. Click Tools > Fiddler Options.

c. Select the HTTPS tab.

d. Click the Export Root Certificate to Desktop button.

3.  Configure Firefox to trust the Fiddler Root Certificate.

a. Open Firefox.

b. Click Tools > Options.

c. Click Advanced.

d. Click the Encryption tab.

e. Click View Certificates.

f. Click the Authorities tab.

g. Click Import.

h. Select FiddlerRoot.cer from the Desktop.

i. Check Trust this CA to identify websites.

j. Click OK.