Examine source code of Keyboard Hotkey Helper

{
  "manifest_version": 2,
  "name": "Keyboard Hotkey Helper",
  "description": "Show a unified list of keyboard hotkeys for the current site (Gmail, YouTube, etc.)",
  "version": "1.0.1",
  "icons": {
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/icon-64.png",
    "default_title": "Hotkey Helper",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b8c7f179-ebf9-46d1-9a76-5d018fd5f4b9}",
      "strict_min_version": "126.0"
    }
  }
}