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Installing root certificate authority in Firefox (Linux)

Open the Preferences window.
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Select Privacy & Security in the menu on the left side, scroll to the bottom and click the View Certificates… button.
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Select the Authorities tab and click the Import… button.
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Find the certificate file named wrc-root-ca.crt you previously downloaded, select it and click the Open button.
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Check the Trust this CA to identify websites option and click the OK button to install the certificate.
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