Examine source code of Portico Web Clipper

{
  "manifest_version": 2,
  "name": "Portico",
  "description": "Keep all your travel ideas in one place.",
  "version": "1.1",
  "icons": {
    "16": "images/icons/icon16.png",
    "32": "images/icons/icon32.png",
    "48": "images/icons/icon48.png",
    "64": "images/icons/icon64.png",
    "128": "images/icons/icon128.png"
  },
  "browser_action": {
    "default_icon": "images/icons/icon128.png",
    "default_title": "Add to Portico"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "<all_urls>",
    "storage"
  ],
  "web_accessible_resources": [
    "images/*.png",
    "css/*",
    "js/*",
    "templates/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content.js"
      ]
    }
  ]
}