Examine source code of DocuINK PDF tool

{
  "manifest_version": 3,
  "name": "__MSG_extension_name__",
  "version": "1.0.0.6",
  "action": {
    "default_title": "__MSG_go_to_docuink__",
    "default_area": "navbar",
    "default_icon": {
      "16": "images/ic_firefox-online_16.png",
      "32": "images/ic_firefox-online_32.png",
      "48": "images/ic_firefox-online_48.png",
      "128": "images/ic_firefox-online_128.png"
    }
  },
  "default_locale": "en",
  "description": "__MSG_extension_description__",
  "icons": {
    "16": "images/ic_firefox-online_16.png",
    "32": "images/ic_firefox-online_32.png",
    "48": "images/ic_firefox-online_48.png",
    "128": "images/ic_firefox-online_128.png"
  },
  "permissions": [
    "scripting",
    "activeTab",
    "tabs",
    "cookies"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*/*.pdf",
        "http://*/*.pdf"
      ],
      "js": [
        "my-content-script.js"
      ]
    },
    {
      "matches": [
        "https://docuink.evolaclass.com/*",
        "https://docuink-test.evolaclass.com/*",
        "https://tennydev.evolaclass.com/*"
      ],
      "js": [
        "docuink-content-script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "embedded.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "penpowerinc.docuink.extension@gmail.com",
      "strict_min_version": "112.0"
    }
  },
  "developer": {
    "name": "Tennyson Lu",
    "url": "https://www.penpowerinc.com/"
  }
}