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DEV: Disable upload instrumentation if performance.measure returns un…
…defined (#14427) Firefox does not return a PerformanceMeasure object when using performance.mark and performance.measure, even though MDN says it should https://developer.mozilla.org/en-US/docs/Web/API/Performance/measure#return_value So for now, we disable the upload instrumentation with a test to see if a PerformanceMeasure (or anything really) is returned.
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