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Firefox has too many abstraction layers. The other day I've managed to break the multi-account containers, because I pressed Enter (to confirm opening a site in a different container) faster than the confirmation page finished loading, which yielded a) an empty tab with no site, and b) a confirmation page with no URL in it, that did nothing.

Software should never break because flesh-and-bone human user is "too fast" for it.

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I used to work on drivers and firmware for consumer electronics remote controls, and the empirical threshold we used at the time, was that an average human cannot press a button two times in a row much faster than with a 200 ms delay. (So, if the driver was getting same key presses spaced by less than that, it could safely assume those come from auto-repeat in the RC.)

200ms sounds surprisingly high. I can imagine it being hard to press a button two times in a row in <200ms with a cold start, but if you already have a controller in your hand and it's even minimally ergonomic, pressing the same button 5 times with average <200ms delay between each should be relatively easy for most kids and adults.

My guess is, whoever came up with that threshold has never played any console game.

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