alt Hacker NewsFirefox offers it: https://support.mozilla.org/en-US/kb/global-privacy-control
They don't seem to call it GPC, but their "ask websites not to track" feature now uses it instead of GPC.
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stingraycharles • yesterday at 12:56 PM
Yes ok, and Firefox was also the only browser that offered DNT, which is why it pretty much died.
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I wonder how many websites use that header as part of their fingerprint mechanism.