Examine source code of Lenz

{
  "applications": {
    "gecko": {
      "id": "lenz@ultralightgames.com"
    }
  },
  "manifest_version": 2,
  "name": "Lenz",
  "version": "1.0",
  "description": "Move a virtual magnifying lens around any web page. Tinker with the lens shape, size and magnifying power.",
  "browser_action": {
    "browser_style": false,
    "default_icon": {
      "128": "lenzicon.png"
    },
    "default_popup": "controls/lenzcontrols.html"
  },
  "icons": {
    "128": "icon_128.png"
  },
  "background": {
    "scripts": [
      "lenzbackground.js"
    ]
  },
  "web_accessible_resources": [
    "bubble.png",
    "cylinder.png"
  ],
  "permissions": [
    "<all_urls>"
  ]
}