I'm just wondering if anyone else is experiencing this. Using a two finger back swipe to go to previous page, the page will start to slide, then freeze and the page doesn't respond to anything. Resetting PRAM fixes it, but it always comes back. I had a 2015 rMBP and it would do this occasionally, maybe once every couple months, but I just got a 2016 non-TB MBP and started it fresh as a new computer and have had to reset PRAM at least five times in the past week to fix this. The only extensions I have are an ad blocker (wipr) and RES. Before that I used ublock and RES and experienced the same thing.