For OSX I wound up doing the completely built-in route. > Create Automator Workflow Service > Assign Hotkey to service > service has one item: Run applescript.

I miss the days when applications came with proper applescript dictionaries. Nowadays I have to pull shit like

  tell application "System Events"
      tell process "Firefox"
          get menu item "Quit" of menu "File" of menu bar 1
          click
      end tell
  end tell