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How can I create a whitelist of banking websites based on the server certifcates of legitimate sites?

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I want to configure FF so that I can optionally activate a whitelist of my legitimate banking websites. When the whitelist is turned on, FF should only be able to display those sites. When the whitelist is turned off, FF works as usual and displays all sites. I would create the whitelist by visiting my banking websites and somehow adding the server certificates of those sites to the whitelist. So the whitelist would consist of the server certs of my banking websites. When whitelisting is then turned on, FF would allow me to visit only those sites whose server certs match those on the whitelist. This would protect me against phishing sites. How can I do this? Thanks