Examine source code of Price Round

{
  "manifest_version": 2,
  "name": "Price Round",
  "version": "0.1.2",
  "content_scripts": [
    {
      "matches": [
        "https://*/sch/*"
      ],
      "js": [
        "roundr.js"
      ]
    }
  ],
  "applications": {
    "gecko": {
      "id": "sourcedav@gmail.com"
    }
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ],
  "description": "Rounds all prices up to get rid of psychological pricing."
}