Examine source code of Bionify - Bionic Reading Plugin

{
  "name": "Bionify - Bionic Reading Plugin",
  "action": {
    "default_icon": {
      "64": "icons/bionify-icon64.png"
    },
    "default_title": "Bionify!",
    "default_popup": "options.html"
  },
  "icons": {
    "16": "icons/bionify-icon16.png",
    "32": "icons/bionify-icon32.png",
    "48": "icons/bionify-icon48.png",
    "64": "icons/bionify-icon64.png",
    "128": "icons/bionify-icon128.png"
  },
  "manifest_version": 3,
  "version": "1.0.2",
  "description": "Bionify is a WebBrowser extension that allows for Bionic Reading on many webpages.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "bionify@addon.org",
      "strict_min_version": "42.0"
    }
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "./background.js"
    ]
  },
  "options_ui": {
    "browser_style": false,
    "page": "./options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ]
}