Examine source code of Uppercasify

{
  "manifest_version": 2,
  "name": "Uppercasify",
  "version": "1.1",
  "description": "Uppercase all the text.",
  "icons": {
    "96": "icons/uppercasify-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "uppercasify.js"
      ]
    }
  ]
}