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At first I thought this was a Firefox bug but disabling each extension caused me to realize it is in metamask.
I am running 59.0b13 (64-bit) on a MacBook Pro (Retina, 15-inch, Mid 2015) with MacOS 10.13.3
I develop a Shopify app and anytime I try to login to a Shopify stores admin panel. Firefox locks up and spins the CPU all the way up. I then have to force quit.
To replicate go to any Shopify store and add "/admin" to the domain.