scripty-save-hubspot-on-cmd-enter.js

window.addEventListener('keydown', function(event) {
  if ((event.metaKey || event.ctrlKey) && event.key === 'Enter') {
    let buttons = document.getElementsByClassName("uiButton");
    for (let i = 0; i < buttons.length; i++) {
      let button = buttons[i];
      if (button.attributes && button.attributes["data-selenium-test"]) {
        if (button.attributes["data-selenium-test"].value === "UniversalSaveBar-button-primary") {
        button.click();
        break;
        }
      }
    }
  }
});

Activate when the URL matches this regexp: https://app.hubspot.com/contacts/(\d+)/record/