Examine source code of Reddit Focus Blocker

{
  "manifest_version": 3,
  "name": "Reddit Focus Blocker",
  "version": "1.0.3",
  "description": "Redirects Reddit visits to a quiet, offline focus reminder.",
  "browser_specific_settings": {
    "gecko": {
      "id": "reddit-redirect@ayanamikaine.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "140.0"
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "declarativeNetRequestWithHostAccess"
  ],
  "host_permissions": [
    "*://reddit.com/*",
    "*://*.reddit.com/*",
    "*://redd.it/*",
    "*://*.redd.it/*",
    "*://redditmedia.com/*",
    "*://*.redditmedia.com/*",
    "*://redditstatic.com/*",
    "*://*.redditstatic.com/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "blocked.html",
        "blocked.css"
      ],
      "matches": [
        "*://reddit.com/*",
        "*://*.reddit.com/*",
        "*://redd.it/*",
        "*://*.redd.it/*",
        "*://redditmedia.com/*",
        "*://*.redditmedia.com/*",
        "*://redditstatic.com/*",
        "*://*.redditstatic.com/*"
      ]
    }
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "reddit_redirect_rules",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  }
}