Examine source code of Reddit Image Counter

{
  "manifest_version": 3,
  "name": "Reddit Image Counter",
  "description": "Shows an image counter on reddit carousel galleries.",
  "version": "4.1",
  "permissions": [
    "storage"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Reddit Image Counter"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*",
        "*://new.reddit.com/*",
        "*://www.reddit.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "reddit-image-counter@taqy",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "150.0"
    }
  }
}