Examine source code of APNG Capturer

{
  "manifest_version": 3,
  "name": "APNG Capturer",
  "version": "0.1.0",
  "description": "Drag a box on any page and get the next few seconds back as an animated PNG.",
  "browser_specific_settings": {
    "gecko": {
      "id": "apng-capturer@tina",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "downloads",
    "storage"
  ],
  "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_title": "Capture a region as APNG",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  },
  "background": {
    "scripts": [
      "src/apng.js",
      "src/background.js"
    ]
  }
}