Firefox describes their malware posture at https://support.mozilla.org/en-US/kb/how-does-phishing-and-malware-protection-work which heavily leverages Google SafeBrowsing, as do many a browser. Settings for SafeBrowsing are set in the browser.safebrowsing.downloads.remote.enabled pref. To lock this pref, you would need to create an autoconfig.js file in
/Applications/Firefox.app/Contents/Resources/defaults/pref that points to a firefox.cfg file with a lock pref in it. To do so, create the autoconfig.js file and paste in these settings:
// Configure SafeBrowsing
pref("general.config.filename", "firefox.cfg");
pref("general.config.obscure_value", 0);
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Then create the firefox.cfg file and paste in these settings:
// Configuring SafeBrowsing
lockPref("browser.safebrowsing.downloads.remote.enabled", TRUE)
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Live Firefox preferences can be seen at /Users/charles.edge 1/Library/Application Support/Firefox/Profiles/*.default. Because SafeBrowsing is enabled by default, you shouldn’t see it listed unless it’s been disabled. But you can confirm it’s doing its thing by parsing the contents of these settings:
user_pref("browser.safebrowsing.provider.google4.lastupdatetime", "1537457871853");
user_pref("browser.safebrowsing.provider.google4.nextupdatetime", "1537459685853");
user_pref("browser.safebrowsing.provider.mozilla.lastupdatetime", "1537457872202");
user_pref("browser.safebrowsing.provider.mozilla.nextupdatetime", "1537461472202");
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