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`browser.newtabpage.activity-stream.asrouter.providers.snippets` These (which landed in FF64 with snippets above) are not in the user.js, so why bother with the snippet one - `browser.newtabpage.activity-stream.asrouter.providers.cfr` - `browser.newtabpage.activity-stream.asrouter.providers.onboarding` also these aren't in the user.js - `browser.newtabpage.activity-stream.asrouter.providers.cfr-fxa` - `browser.newtabpage.activity-stream.asrouter.providers.message-groups` - `browser.newtabpage.activity-stream.asrouter.providers.messaging-experiments` - `browser.newtabpage.activity-stream.asrouter.providers.whats-new-panel` There are no privacy concerns here. At the end of the day, what Firefox connects to and sends is E2EE and only used locally in non-web content: and you have other prefs and a UI to disable them from being displayed