Oh no. Maybe you can configure this? https://support.mozilla.org/en-US/kb/customizing-firefox-using-policiesjson https://support.mozilla.org/en-US/kb/customizi

Oh no. Maybe you can configure this? https://support.mozilla.org/en-US/kb/customizing-firefox-using-policiesjson https://support.mozilla.org/en-US/kb/customizing-firefox-usi... Or perhaps use their canary domain to force Firefox to use local DNS? Or just configure it yourself? It's not security if an application can still access the internet. Why not block all internet access except via a proxy server? Which is what a "real" enterprise would do because they can block what they want and have a secure network.