Examine source code of Quick History v2

{
  "manifest_version": 2,
  "name": "Quick History",
  "version": "1.0",
  "description": "Render your browser's history in a stylish toolbar popup UI.",
  "permissions": [
    "history"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4ef2af68-c24a-40f5-ab84-28929b46393a}"
    }
  }
}