Examine source code of Focus Mode for IG

{
  "manifest_version": 3,
  "name": "Focus Mode for IG",
  "version": "2.1.0",
  "description": "Curate Instagram: show only accounts you allow in Home, block hashtags and AI content, mute Reels/Explore.",
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "declarativeNetRequest",
    "scripting"
  ],
  "host_permissions": [
    "https://www.instagram.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Focus Mode for IG",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ua_mobile",
        "enabled": false,
        "path": "rules.json"
      }
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.instagram.com/*"
      ],
      "js": [
        "settings.js",
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "focus-mode-for-ig@elmehdi",
      "strict_min_version": "121.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}