Examine source code of InstaNav Pro

{
  "manifest_version": 2,
  "name": "InstaNav Pro",
  "version": "1.0.1",
  "description": "Simple keyboard navigator for Instagram desktop.",
  "browser_specific_settings": {
    "gecko": {
      "id": "instanav-pro@sahil044",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "downloads"
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "InstaNav Pro",
    "default_popup": "popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://instagram.com/*",
        "*://*.instagram.com/*"
      ],
      "js": [
        "content/content-script.js"
      ],
      "run_at": "document_start"
    }
  ]
}