Examine source code of Instagram Volume Control

{
  "manifest_version": 2,
  "name": "Instagram Volume",
  "version": "1.0",
  "description": "Control audio volume for Instagram (videos, reels, stories).",
  "permissions": [
    "tabs",
    "storage",
    "https://*.instagram.com/*",
    "https://instagram.com/*"
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_title": "Instagram Volume",
    "default_icon": {
      "48": "icons/icon.svg"
    }
  },
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.instagram.com/*",
        "https://instagram.com/*"
      ],
      "js": [
        "content/content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "content/injected.js"
  ],
  "icons": {
    "48": "icons/icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fa3b2c91-7e58-4d06-a63f-19e8c0d51b84}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}