Examine source code of Åsberg Slideshow

{
  "manifest_version": 2,
  "name": "Slideshow",
  "version": "0.0.0",
  "icons": {
    "24": "icon.png",
    "48": "icon@2x.png",
    "96": "icon@4x.png"
  },
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "contextMenus"
  ]
}