Oh, they reverted the font rendering change. Having a deeper look at bugzilla I didn't realise ClearType was such a mess, storing values in different places, and Firefox only looking at values for the main display which can mess things up for those who use multiple monitors.
EDIT: For those that did the registry fix you'll have to undo those before updating: https://www.reddit.com/r/firefox/comments/10ed7o2/comment/j4qar9y/
	
		
			
		
		
	
				
			EDIT: For those that did the registry fix you'll have to undo those before updating: https://www.reddit.com/r/firefox/comments/10ed7o2/comment/j4qar9y/
			
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