The old value, 20 Hz, is too low for games running at 60 fps. The new polling rate of 250 Hz is consistent with Chrome's polling rate, see [0], so developers should be less surprised about differences between browsers. [0]: https://source.chromium.org/chromium/chromium/src/+/main:device/gamepad/gamepad_provider.cc;l=100;drc=bb9cd02c17a2e8a8bdeca3712d357ca3d15a95bf Differential Revision: https://phabricator.services.mozilla.com/D175671
