Examine source code of QR Coder by chall3ng3r

{
  "manifest_version": 2,
  "name": "QRCoder",
  "version": "2.1resigned1",
  "description": "Quickly get QR Code for currently open page. Now using in-browser QR code generator.",
  "icons": {
    "48": "gfx/qr-coder-48.png",
    "96": "gfx/qr-coder-96.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "gfx/qr-coder-32.png",
    "default_title": "QR Coder",
    "default_popup": "popup/qrcoder.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f6502942-9de7-4ffe-85b3-d589b1a707f4}"
    }
  }
}