Examine source code of Korterelink

{
  "manifest_version": 2,
  "name": "Korterelink",
  "version": "1.3",
  "description": "Højreklik for at lave kortere links, ved hjælp af Korterelink.dk",
  "author": "Jasper O. C.",
  "permissions": [
    "contextMenus",
    "clipboardWrite",
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/logo16.png",
    "32": "icons/logo32.png",
    "48": "icons/logo48.png",
    "128": "icons/logo128.png"
  },
  "background": {
    "scripts": [
      "script.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/logo32.png",
    "default_popup": "popup/popup.html"
  }
}