userChromeUnbindKey function for use with userChromeJS

function userChromeUnbindKey(keyset_id, key_id) {
  console.log("userChromeUnbindKey");
  var keyset = document.getElementById(keyset_id);
  if (!keyset) {
    console.log("Could not find keyset " + keyset_id);
    return;
  }
  var key = document.getElementById(key_id);
  if (!key) {
    console.log("Could not find key " + key_id);
    return;
  }
  keyset.removeChild(key);
}

// Example usage
// Look in https://searchfox.org/comm-central/rev/7d1490648ebd27d61cfe7fe8272a8ebb7c9f8e5c/suite/mailnews/content/mailWindowOverlay.xul
// (searchfor "<keyset") to find the names of keys to unbind.
if (location.href.startsWith("chrome://messenger/content/messenger.x")) {
  userChromeUnbindKey("mailKeys", "key_archive");
  userChromeUnbindKey("mailKeys", "key_killThread");
  userChromeUnbindKey("mailKeys", "key_killSubthread");
  userChromeUnbindKey("mailKeys", "key_watchThread");
}