Examine source code of Sold by Amazon Button

{
  "manifest_version": 2,
  "name": "Sold by Amazon Button",
  "version": "0.1.0",
  "description": "Adds a button to Amazon.com to filter results to Ship and Sold by Amazon",
  "permissions": [
    "activeTab",
    "*://www.amazon.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.amazon.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2fe06344-3de2-42bd-a604-40eb8a897120}"
    }
  }
}