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Firefox needs an explicit type on <source> to pick a decoder, especially when the URL's extension is followed by a query string (?tag=29) rather than ending cleanly in .mp4. fxtwitter's own response confirms these are always video/mp4. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014c1L8ghNBFjfiH64UMViP8