Examine source code of Keyword Filter for Reddit

{
  "manifest_version": 3,
  "name": "Keyword Filter for Reddit",
  "version": "1.1.0",
  "description": "Filter Reddit posts containing user-defined keywords",
  "browser_specific_settings": {
    "gecko": {
      "id": "reddit-keyword-filter@fredr.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://*.reddit.com/*"
  ],
  "icons": {
    "48": "icons/icon-48.svg",
    "96": "icons/icon-96.svg"
  },
  "action": {
    "default_icon": {
      "48": "icons/icon-48.svg",
      "96": "icons/icon-96.svg"
    },
    "default_title": "Keyword Filter for Reddit",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "shared/storage.js",
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "shared/storage.js",
        "content/old-reddit.js",
        "content/new-reddit.js",
        "content/reddit-filter.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}