Examine source code of PixelPerfect Screenshot

{
  "manifest_version": 2,
  "name": "PixelPerfect Screenshot",
  "version": "7.4",
  "description": "Ultra-high quality screenshot tool with adjustable rounded corners",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "PixelPerfect Screenshot"
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "downloads",
    "storage",
    "tabs",
    "clipboardWrite"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "commands": {
    "capture_area": {
      "suggested_key": {
        "default": "Alt+C",
        "mac": "Alt+C"
      },
      "description": "Capture selected area"
    },
    "capture_full": {
      "suggested_key": {
        "default": "Ctrl+Shift+F",
        "mac": "Command+Shift+F"
      },
      "description": "Capture full page"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "shs.svo@gmail.com",
      "strict_min_version": "79.0"
    }
  }
}