Examine source code of InstaMediaAssist

{
  "manifest_version": 3,
  "name": "InstaMediaAssist",
  "description": "High-quality media downloader for Instagram.",
  "version": "1.0.0",
  "permissions": [
    "storage",
    "downloads",
    "scripting"
  ],
  "host_permissions": [
    "*://*.instagram.com/*"
  ],
  "action": {
    "default_icon": "icons/icon128.png"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "instamediaassist-downloader@amo.mozilla.org",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "src/background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.instagram.com/*"
      ],
      "js": [
        "src/inject.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    },
    {
      "matches": [
        "*://*.instagram.com/*"
      ],
      "css": [
        "src/style.css"
      ],
      "js": [
        "src/content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "src/inject.js"
      ],
      "matches": [
        "*://*.instagram.com/*"
      ]
    }
  ]
}