Examine source code of Nuke Private Data

{
  "name": "Nuke Private Data",
  "short_name": "Nuke Private Data",
  "version": "1.1resigned1",
  "manifest_version": 2,
  "description": "Ad-free! One-click toolbar button to clear all sorts of private browsing data. Choose which to delete: cookies, browser cache, browsing history, download history, website file systems, form autocomplete data, indexedDB data, local storage, plugin data, data cached by service workers, and saved passwords. From your friends at getfoxyproxy.org. Coming soon: BOOKMARKS.",
  "developer": {
    "name": "Eric H. Jung and FoxyProxy",
    "url": "https://getfoxyproxy.org/"
  },
  "icons": {
    "16": "images/icons/atomic-bomb-16.png",
    "32": "images/icons/atomic-bomb-32.png",
    "64": "images/icons/atomic-bomb-64.png",
    "96": "images/icons/atomic-bomb-96.png"
  },
  "options_ui": {
    "page": "settings.html"
  },
  "browser_action": {
    "default_icon": {
      "16": "images/icons/atomic-bomb-16.png",
      "32": "images/icons/atomic-bomb-32.png",
      "64": "images/icons/atomic-bomb-64.png",
      "96": "images/icons/atomic-bomb-96.png"
    },
    "default_title": "Nuke Private Data",
    "default_popup": "popup.html"
  },
  "applications": {
    "gecko": {
      "id": "nuke-private-data@getfoxyproxy.org"
    }
  },
  "permissions": [
    "browsingData",
    "storage",
    "bookmarks"
  ]
}