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While the article doesn't specifically say, this will likely use the Firefox Studies(https://support.mozilla.org/en-US/kb/shield https://support.mozilla.org/en-

by pavon 7y ago

While the article doesn't specifically say, this will likely use the Firefox Studies(https://support.mozilla.org/en-US/kb/shield https://support.mozilla.org/en-US/kb/shield) system which does have an opt-out (Maybe even opt-in? Been a while since I've done a fresh FF install).