Firefox
# Open the '''Advanced Encryption ''' window:
#* On Windows: Pull down the '''Tools''' menu and select '''Options…'''
#* On Mac: Pull down the '''FirefoxThunderbird''' menu and select '''Preferences...'''
# Select '''Advanced'''
# Select '''Encryption'''
# Click on '''View Certificates''' to open the '''Certificate Manager'''
# Select '''Authorities'''
# Click on '''View Certificates'''
# Select the Root Certificate that you want to change
# Click on '''Edit...'''
# Select/Unselect the check-boxes indicating the trust bits, then click on '''OK''
# Click on OK in the '''Certificate Manager'''
# Close the '''Advanced Encryption''' window
Thunderbird
# Open the '''Advanced Certificates ''' window:
#* On Windows: Pull down the '''Tools''' menu and select '''Options…'''
#* On Mac: Pull down the '''Thunderbird''' menu and select '''Preferences...'''
# Click on '''Edit...'''
# Select/Unselect the check-boxes indicating the trust bits, then click on '''OK''
# Click on OK in the C'''ertificate Certificate Manager'''# Close the '''Advanced Certificates ''' window
'''Important:''' This change will be permanent, such that it can only be changed again by you. This change will not be affected by upgrading to newer versions of Mozilla software.