Examine source code of Rounded price for Amazon

{
  "manifest_version": 2,
  "version": "0.6.5",
  "name": "Rounded price for Amazon",
  "short_name": "Price rounder",
  "description": "Rounds up prices on Amazon .com and .ca work for en and fr languages",
  "icons": {
    "32": "icons/32.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "browser_style": true,
    "default_popup": "main.html",
    "default_icon": "icons/32.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.amazon.ca/*",
        "*://www.amazon.com/*"
      ],
      "js": [
        "myscript.js"
      ]
    }
  ]
}