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site that works nicely at Chrome gives "page to slow..." message at freezes with Firefox (due to drawing line in canvas)

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Getting error message "A web page is slowing down your browser..." The same site works well with Chrome. To reproduce visit qvkly.com login with any social account and make video call. Then click "Graph" button on top of the screen

It shows 10 canvas elements that draw line. Using FireFox 57,0 (windows 64 bits)

Getting error message "A web page is slowing down your browser..." The same site works well with Chrome. To reproduce visit qvkly.com login with any social account and make video call. Then click "Graph" button on top of the screen It shows 10 canvas elements that draw line. Using FireFox 57,0 (windows 64 bits)

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