I think the browser.html team will be very interested in this feedback. I sat with them as they poured over Cocoa disassembly and source trying to replicate the

I think the browser.html team will be very interested in this feedback. I sat with them as they poured over Cocoa disassembly and source trying to replicate the behavior as best they could. We definitely have some things to improve. Because we are using our own rendering system to draw on the GPU, we can't use Apple's implementation of this stuff which requires buying into Core Graphics/Core Animation completely I believe. Note that I don't think Firefox has overscroll at all, except maybe on mobile.