Examine source code of Tenseiglass

{
  "manifest_version": 2,
  "name": "Tenseiglass",
  "version": "1.1",
  "description": "Provides a text interface to Wolfeon's Tenseigan Box App",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://tenseigan.herokuapp.com/box"
      ],
      "js": [
        "tenseiglass.js"
      ]
    }
  ]
}