Examine source code of Google Toolbox

{
  "manifest_version": 2,
  "name": "Google Toolbox",
  "short_name": "google-toolbox",
  "description": "180+ Google products readily available at your fingertips!",
  "version": "1.0.0",
  "homepage_url": "https://github.com/ayltai/google-toolbox-webextension",
  "author": "Alan Tai",
  "applications": {
    "gecko": {
      "id": "{2094e8aa-a5c6-4e34-936a-ced0057b33ad}",
      "strict_min_version": "58.0"
    }
  },
  "icons": {
    "16": "icons/icon-white.svg",
    "24": "icons/icon-white.svg",
    "32": "icons/icon-white.svg",
    "48": "icons/icon-white.svg",
    "64": "icons/icon-white.svg",
    "72": "icons/icon-white.svg",
    "96": "icons/icon-white.svg",
    "128": "icons/icon-white.svg",
    "144": "icons/icon-white.svg",
    "192": "icons/icon-white.svg",
    "256": "icons/icon-white.svg",
    "512": "icons/icon-white.svg"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "browser_action": {
    "browser_style": true,
    "default_title": "Google Toolbox",
    "default_popup": "index.html",
    "default_icon": {
      "16": "icons/icon-white.svg",
      "24": "icons/icon-white.svg",
      "32": "icons/icon-white.svg",
      "48": "icons/icon-white.svg",
      "64": "icons/icon-white.svg",
      "72": "icons/icon-white.svg",
      "96": "icons/icon-white.svg",
      "128": "icons/icon-white.svg",
      "144": "icons/icon-white.svg",
      "192": "icons/icon-white.svg",
      "256": "icons/icon-white.svg",
      "512": "icons/icon-white.svg"
    },
    "theme_icons": [
      {
        "dark": "icons/icon-black.svg",
        "light": "icons/icon-white.svg",
        "size": 16
      },
      {
        "dark": "icons/icon-black.svg",
        "light": "icons/icon-white.svg",
        "size": 24
      },
      {
        "dark": "icons/icon-black.svg",
        "light": "icons/icon-white.svg",
        "size": 32
      },
      {
        "dark": "icons/icon-black.svg",
        "light": "icons/icon-white.svg",
        "size": 48
      },
      {
        "dark": "icons/icon-black.svg",
        "light": "icons/icon-white.svg",
        "size": 64
      },
      {
        "dark": "icons/icon-black.svg",
        "light": "icons/icon-white.svg",
        "size": 72
      },
      {
        "dark": "icons/icon-black.svg",
        "light": "icons/icon-white.svg",
        "size": 96
      },
      {
        "dark": "icons/icon-black.svg",
        "light": "icons/icon-white.svg",
        "size": 128
      },
      {
        "dark": "icons/icon-black.svg",
        "light": "icons/icon-white.svg",
        "size": 144
      },
      {
        "dark": "icons/icon-black.svg",
        "light": "icons/icon-white.svg",
        "size": 192
      },
      {
        "dark": "icons/icon-black.svg",
        "light": "icons/icon-white.svg",
        "size": 256
      },
      {
        "dark": "icons/icon-black.svg",
        "light": "icons/icon-white.svg",
        "size": 512
      }
    ]
  },
  "options_ui": {
    "open_in_tab": false,
    "page": "options/index.html"
  }
}