Examine source code of QR.me

{
  "manifest_version": 2,
  "name": "QR.me",
  "version": "1.2",
  "description": "Continue browsing on your phone from your desktop, or share with friends what you're browsing.",
  "icons": {
    "48": "icons/qr_me.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.<all_urls>/*"
      ],
      "js": [
        "qrmark.js"
      ]
    }
  ],
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "browser_style": true,
    "default_title": "QR.me",
    "default_popup": "/popup.html",
    "default_icon": {
      "48": "icons/qr_me.svg"
    }
  }
}