2016-09-28 UTC
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Zegnat KevinMarks, sknebel and I were testing with window.fetch() and User-Agent strings a little during IWC. It seems Firefox does support overwriting the UA, but not with an empty string: https://github.com/Zegnat/verify-me-locally/commit/51d45f601d6058126cf949439b5feb5f7696c1e5