Here the sequence for form elements when using `send_keys("F")`: { "type": "keydown", "keyCode": 70, "content": "" }, { "type": "keypress", "keyCode": 0, "content": "" }, { "type": "input", "keyCode": null, "content": "F" }, { "type": "keyup", "keyCode": 70, "content": "F" } Events like `keydown`, `keypress`, and `keyup` should contain the same key code. But this is not the case for `keypress` here. This might need bug 1418995 being fixed.

(In reply to Henrik Skupin (:whimboo) from comment #0) > Events like `keydown`, `keypress`, and `keyup` should contain the same key > code. But this is not the case for `keypress` here. That's not true for Firefox. Check what Firefox actually does here: https://dvcs.w3.org/hg/d4e/raw-file/tip/key-event-test.html -- you'll see that keyCode is 0 with keyPress in Firefox. See also https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode -- the 0 is by design.