Examine source code of WikiSum

{
  "manifest_version": 2,
  "name": "Wikipedia Summarizer",
  "version": "1.0",
  "description": "Quickly summarize Wikipedia articles",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon48.png"
  },
  "icons": {
    "48": "icon48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.wikipedia.org/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bedcdf4b-dd49-4e95-a5aa-c4ba461acef3}"
    }
  }
}