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The explanation for the retraction doesn't explain that user agent string. It's weird enough coming from macOS; it's even weirder coming from Firefox.

The behavior's still concerning in any case, whether it's macOS silently doing it or Firefox silently doing it.

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The original tweets explained it. The user agent is impersonating a shared Facebook/Twitter/etc link preview/thumbnail. Many sites respond with markup more appropriate for a thumbnail when using that user agent, and if not, it’s unlikely that they serve anything worse, so it’s little harm done.

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