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Memory use under FF 42.0

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Displaying this very website under FF 42.0 requires 270 MB. Watching an HTML5 1080p video stream on twitch.tv on Microsoft Edge requires ~280MB.

What is wrong with Firefox?

Displaying this very website under FF 42.0 requires 270 MB. Watching an HTML5 1080p video stream on twitch.tv on Microsoft Edge requires ~280MB. What is wrong with Firefox?

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