Examine source code of Wikipedia

{
  "manifest_version": 2,
  "name": "Wikipedia",
  "version": "1.0",
  "description": "A simple way to quickly reference Wikipedia",
  "homepage_url": "https://github.com/potat0chip/firefox-wikipedia-extension",
  "icons": {
    "48": "icons/wikipedia.jpg"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/wikipedia.jpg",
    "default_title": "Wikipedia",
    "default_popup": "popup/wikipedia.html"
  },
  "web_accessible_resources": [
    "icons/wikipedia.jpg"
  ]
}