Examine source code of Cloud Duplicate Finder

{
  "description": "Remove duplicate data from GoogleDrive , Dropbox, OneDrive and Box via cloudduplicatefinder.com",
  "manifest_version": 2,
  "name": "Cloud Duplicate Finder",
  "version": "1.1resigned1",
  "homepage_url": "https://cloudduplicatefinder.com/",
  "icons": {
    "48": "icons/beasts-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/beasts-32.png",
    "theme_icons": [
      {
        "light": "icons/beasts-32-light.png",
        "dark": "icons/beasts-32.png",
        "size": 32
      }
    ],
    "default_title": "Cloud Duplicate Finder",
    "default_popup": "popup/cloud_up.html"
  },
  "web_accessible_resources": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a464913e-fbb2-43b9-8895-ebf1058e4cdd}"
    }
  }
}