Examine source code of ESI testing extension

{
  "name": "ESI testing extension",
  "author": "Dima Kurilo <dkurilo@gmail.com>",
  "version": "1.6.1resigned1",
  "manifest_version": 2,
  "description": "Extension allows to debug ESI sites",
  "homepage_url": "https://github.com/DKurilo/esi_testing_extension",
  "applications": {
    "gecko": {
      "id": "esi-testing-extension@kurilo.us",
      "strict_min_version": "57.0"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "src/classes/prefixes.js",
      "src/bg/background.js"
    ]
  },
  "options_ui": {
    "page": "src/options/options.html",
    "browser_style": true
  },
  "browser_action": {
    "default_icon": "icons/icon48.png",
    "default_title": "Site settings",
    "default_popup": "src/popup/popup.html"
  },
  "default_locale": "en",
  "permissions": [
    "activeTab",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "storage"
  ]
}