Examine source code of Simple Companion Extension

{
  "manifest_version": 3,
  "name": "Simple Companion Extension",
  "version": "1.3.3",
  "description": "Track items, materials, and NPC encounters on the SimpleMMO travel page.",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://web.simple-mmo.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "simplemmo-tracker@example.com",
      "strict_min_version": "142.0",
      "strict_min_version_android": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "favicon-16x16.png",
    "32": "favicon-32x32.png",
    "192": "android-chrome-192x192.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://web.simple-mmo.com/travel*",
        "https://web.simple-mmo.com/npcs/attack*",
        "https://web.simple-mmo.com/abyss",
        "https://web.simple-mmo.com/abyss/*",
        "https://web.simple-mmo.com/abyss*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "action": {
    "default_title": "Simple Companion Tracker",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "favicon-16x16.png",
      "32": "favicon-32x32.png"
    }
  }
}