Examine source code of JSClearCookie

{
  "manifest_version": 2,
  "name": "JsClearCookie",
  "description": "Clear the specified cookies by js",
  "version": "1.1.1",
  "icons": {
    "48": "icons/cookie-48.png",
    "64": "icons/cookie-64.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background-script.js"
    ]
  },
  "permissions": [
    "cookies",
    "<all_urls>",
    "tabs",
    "activeTab"
  ]
}