Menu doesn't open in landscape mode
Tab overview page not working consistently - this one is hard to capture right now but what happens is when you have a large amount of tabs open (say over 30), when you hit the tab overview button it doesn't take you to the currently open tab in the list, instead it takes you to the very top. This is not the normal behaviour. If you open and close it a few times it will randomly work properly 1/10 times.
Could be but I don't think so in this case. It seems (based on no evidence - purely feel) that there's some kind of event listener being triggered every time the page scrolls (whether this be touch/scroll event, visible contents, etc idk) and this event listener has different optimisation or performance characteristics depending on the device and rendering engine.