Examine source code of Unwish Twitter

{
  "manifest_version": 2,
  "name": "Unwish",
  "version": "1.0",
  "description": "Extension to remove Amazon wishlists from Twitter",
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*"
      ],
      "js": [
        "unwish.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "test@extension"
    }
  }
}