Examine source code of Full Page Capture

{
  "manifest_version": 2,
  "name": "Full Page Capture",
  "version": "1.5.8",
  "description": "Capture full-page screenshots by scrolling and stitching. Processing happens locally; nothing is sent to any server.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{2f4fd0f0-44d2-4b0f-9b72-3b0f0e5db9d7}",
      "strict_min_version": "102.0"
    }
  },
  "permissions": [
    "activeTab",
    "tabs",
    "downloads"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Full Page Capture",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ]
}