Examine source code of WishCloud

{
  "name": "WishCloud — Dream Sharing",
  "description": "Add your wish",
  "version": "1.1",
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "js/content.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Bookmarks",
    "default_icon": "img/icon.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "img/icon.png"
  },
  "manifest_version": 2
}