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Navigation Timing API secureConnectionStart is not present for HTTPS pages

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For HTTPS pages I'm expecting to get a valid timestamp when accessing performance.timing.secureConnectionStart, but it doesn't exist. This is true even if I'm accessing a page for the first time.

Tested on FF on both Windows (7) and OS X (Sierra).

For HTTPS pages I'm expecting to get a valid timestamp when accessing performance.timing.secureConnectionStart, but it doesn't exist. This is true even if I'm accessing a page for the first time. Tested on FF on both Windows (7) and OS X (Sierra).
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