Examine source code of Context QR Code Generator

{
  "manifest_version": 2,
  "name": "QR Code Generator",
  "version": "1.2",
  "description": "Generate QR code for the current page's URL, a link or a selection of text.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js",
        "qrcode.min.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c94e954c-ab21-4ffc-a95c-e4b6b1088628}"
    }
  }
}