Examine source code of Cookie Cleaner Plus

{
  "manifest_version": 2,
  "name": "Cookie Cleaner Plus",
  "version": "1.0",
  "description": "Extension to quickly clean cookies for the current site or all sites.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Cookie Cleaner Plus",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tenm.a.t.es0.3.0@gmail.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "cookies",
    "tabs",
    "<all_urls>"
  ]
}