Examine source code of Pi Reader

{
  "manifest_version": 2,
  "name": "Pi Reader",
  "description": "Read like a pro",
  "version": "1.0",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./content.js"
      ]
    }
  ],
  "icons": {
    "16": "icon.png"
  },
  "background": {
    "persistent": false,
    "scripts": [
      "./background.js"
    ]
  }
}