Examine source code of Alt & Meta viewer

{
  "name": "Alt & Meta viewer",
  "short_name": "A & M viewer",
  "manifest_version": 2,
  "version": "8.2",
  "description": "Some Alt attributes are used in conjunction with other elements. Some elements are used in conjunction with other elements.",
  "icons": {
    "48": "images/48.png",
    "128": "images/128.png"
  },
  "browser_action": {
    "default_icon": "images/19.png",
    "default_title": "Some Alt attributes are used in conjunction with other elements. Some elements are used in conjunction with other elements.",
    "default_popup": "popup.html"
  },
  "options_page": "options.html",
  "default_locale": "ja",
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "assets/js/jquery-3.7.1.min.js",
        "assets/js/contentscript.js"
      ],
      "css": [
        "assets/css/contentscript.css"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "images/close.svg",
    "images/close_w.svg",
    "images/arrow.svg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{df73969c-af1a-4cdd-bc8c-06cc565be3e6}"
    }
  }
}