http://jsbin.com/cekequd/quiet. Give the top input a large file & watch the console. Firefox completes in ~500ms for a 900mb file, whereas Safari chugs along then crashes. Notably, Firefox doesn't offer result in progress events, which may be related. This may involve a change to the spec https://github.com/w3c/FileAPI/issues/79. This appears to be the same as Chrome bug https://bugs.chromium.org/p/chromium/issues/detail?id=674903
<rdar://problem/32008798>
(In reply to Jake Archibald from comment #0) > This appears to be the same as Chrome bug > https://bugs.chromium.org/p/chromium/issues/detail?id=674903 FYI, Chrome closed their bug as WONTFIX.