Examine source code of Switch Debug View (for Codepen)

{
  "manifest_version": 2,
  "name": "Switch Debug View (for Codepen)",
  "version": "1.1resigned1",
  "description": "Easier debugging of your codepens. Adds a button to switch between Debug and Editor view in Codepen. Opens the tab if it's not open already. Inspired by Codopen ",
  "permissions": [
    "tabs"
  ],
  "icons": {
    "48": "icon/48.png",
    "96": "icon/96.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icon/16.png",
      "32": "icon/32.png",
      "64": "icon/64.png"
    },
    "default_title": "Switch Codepen View",
    "theme_icons": [
      {
        "light": "icon/16-light.png",
        "dark": "icon/16.png",
        "size": 16
      },
      {
        "light": "icon/32-light.png",
        "dark": "icon/32.png",
        "size": 32
      },
      {
        "light": "icon/64-light.png",
        "dark": "icon/64.png",
        "size": 64
      }
    ]
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "author": "Erick Madrigal",
  "homepage_url": "https://debugviewfcdp.erickmadrigal.me",
  "developer": {
    "name": "Erick Madrigal",
    "url": "https://erickmadrigal.me/debugviewfcdp"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{052bf618-7596-4ef1-9713-d055d331de3d}"
    }
  }
}