Examine source code of Yipyap

{
  "manifest_version": 2,
  "name": "Yipyap",
  "version": "1.2",
  "description": "Notebook-able bookmarks.",
  "background": {
    "scripts": [
      "yipyap.js"
    ]
  },
  "icons": {
    "48": "icons/yipyap.svg",
    "96": "icons/yipyap.svg"
  },
  "permissions": [
    "bookmarks"
  ]
}