Examine source code of QR Code Scanner - Funshow

{
  "manifest_version": 2,
  "name": "QR Code Scanner",
  "description": "Scan QR codes from web pages, upload images, and manage scan history.",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "58.0",
      "id": "{3699fb7c-9f71-49dd-a22e-b70c7e670c7b}"
    }
  },
  "sidebar_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "QR Scanner",
    "default_panel": "sidebar/panel.html"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "downloads",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "lib/jsQR.js",
        "content_scripts/qr_scanner.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "lib/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}