Examine source code of ClearBrowserCookies

{
  "manifest_version": 2,
  "name": "ClearAllCookies",
  "version": "1.1resigned1",
  "author": "rc",
  "description": "Clear all cookies",
  "icons": {
    "16": "icons/16.png",
    "19": "icons/19.png",
    "32": "icons/32.png",
    "38": "icons/38.png",
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "browser_action": {
    "default_title": "Clear all cookies",
    "default_icon": {
      "16": "icons/16.png",
      "19": "icons/19.png",
      "32": "icons/32.png",
      "38": "icons/38.png",
      "48": "icons/48.png",
      "96": "icons/96.png"
    },
    "browser_style": false
  },
  "background": {
    "scripts": [
      "ClearAllCookies.js"
    ]
  },
  "permissions": [
    "browsingData"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{91aac118-7bd6-4060-9349-4b10dd55d417}"
    }
  }
}