Examine source code of Archive That

{
  "manifest_version": 2,
  "name": "Archive That",
  "version": "1.0",
  "description": "Adds a webpage to the wayback machine and archive.ph",
  "icons": {
    "48": "icons/archive.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/archive.png",
    "default_title": "Archive That",
    "default_popup": "popup/index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cee9b869-7af2-42e8-8ede-3963f8b2fe8c}"
    }
  }
}