Examine source code of Boards Companion

{
  "manifest_version": 3,
  "name": "Boards Companion",
  "version": "2.5.1",
  "description": "Extension to enhance boards.ie user experience",
  "icons": {
    "16": "src/icons/icon16.png",
    "48": "src/icons/icon48.png",
    "128": "src/icons/icon128.png"
  },
  "action": {
    "default_icon": "src/icons/icon16.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.boards.ie/*"
      ],
      "css": [
        "src/boardsc-style.css"
      ],
      "js": [
        "src/main.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://www.boards.ie/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "/*"
      ],
      "matches": [
        "*://www.boards.ie/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{87846437-1077-4212-abfb-433482c7a63f}"
    }
  }
}