Examine source code of QuestionME

{
  "manifest_version": 3,
  "name": "QuestionME",
  "author": "Kenji",
  "version": "1.0",
  "description": "Creates a summary and questions based on whatever webpage you're on. Length of summary and number of questions is customizable through the settings.",
  "browser_specific_settings": {
    "gecko": {
      "id": "@question-me"
    }
  },
  "permissions": [
    "tabs",
    "scripting",
    "activeTab",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "libs/Readability.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "32": "icons/32x32.jpg",
    "48": "icons/48x48.jpg",
    "64": "icons/64x64.jpg"
  },
  "background": {
    "scripts": [
      "funcs/background.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html"
  }
}