Examine source code of Instagram DM Only

{
  "manifest_version": 3,
  "name": "Instagram DM Only",
  "version": "1.0.0",
  "description": "Always open Instagram on DMs and hide distractions. Click the icon to toggle.",
  "browser_specific_settings": {
    "gecko": {
      "id": "instagram-dm-only@jota95",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png",
      "128": "icons/icon-128.png"
    },
    "default_title": "Instagram Inbox Focus (activa)"
  },
  "permissions": [
    "declarativeNetRequest",
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "*://www.instagram.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.instagram.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}