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You will first need to complete Trust CA - OS for your device before continuing.
Open Firefox and in a new tab select “Settings” from the right-hand hamburger menu:
Select “Privacy and Security” from the left hand navigation menu.
Scroll all the way to the bottom of the page and select “View Certificates”.
Select the “Authorities” tab from the “Certificate Manager”.
Click “Import” and open the downloaded “Embassy Local Root CA.crt” file on your device.
When prompted, check “Trust this CA to identity websites” and select “OK”.
Ensure the “Embassy Local Root CA” exists under “Start9 Labs”. If it does not appear, you may need to close the Certificates pop-up and re-open to refresh the list. Then click “OK” to save.
Open a new tab in Firefox to apply the changes. If this does not work, quit and restart Firefox.
To setup in Firefox Beta or Fennec, go to Settings > About Firefox Beta and tap the Firefox logo several times until it says “Debug menu enabled.” Then return to Settings > Secret Settings and enable “Use third party CA certificates”.
No additional configuration for iOS is required.