Examine source code of Accessify

{
  "manifest_version": 3,
  "name": "Accessify",
  "version": "1.1",
  "description": "Adjusts the current website to make it more accessible.",
  "icons": {
    "48": "icons/icon_48.png"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "accessify@automatic-accessibility",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "accessify.js"
      ],
      "css": [
        "accessible.css"
      ]
    }
  ],
  "action": {
    "default_icon": "icons/icon_32.png",
    "default_title": "Accessify",
    "default_popup": "popup/popup.html"
  }
}