Examine source code of NetBrain Extension

{
  "manifest_version": 3,
  "name": "Netbrain Extension",
  "version": "1.0.2",
  "description": "Netbrain Extension provides the ability to avoid opening duplicated pages.",
  "homepage_url": "http://www.netbraintech.com",
  "icons": {
    "128": "icon_128.png"
  },
  "action": {
    "default_title": "NetBrain Extension",
    "default_icon": "fav.png",
    "default_popup": "index.html"
  },
  "permissions": [
    "tabs",
    "scripting"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/netbrainnv.html?*"
      ],
      "js": [
        "self-find.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*/netbrainnv.html?*"
      ],
      "js": [
        "page-find.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4d656f74-df55-4bff-b5af-96f503248ed4}"
    }
  }
}