Reduce long press duration following Firefox update
Our "longpress" callback is never fired anymore on Firefox nightly (in mobile mode with touch events enabled).
See https://hg.mozilla.org/mozilla-central/rev/faee29a2448b3ce50a23bae2c9ca194511dc6efd which is, I believe, the "culprit".
From my tests 465 is the maximum value for which our event will work, but I'd like to reduce it even more, from a user point of view (I'd like to wait less for the action to happen).