Examine source code of Active Nested Tabs

{
  "manifest_version": 2,
  "name": "Active Nested Tabs",
  "version": "1.1",
  "description": "Addon that loads the largest image file of any nested tabs below the currently selected tab. Requires TreeStyleTabs (TST)",
  "icons": {
    "16": "icons/hello-16.png",
    "48": "icons/hello-48.png",
    "128": "icons/hello-128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/hello-16.png",
      "48": "icons/hello-48.png",
      "128": "icons/hello-128.png"
    },
    "default_title": "Load Largest Images"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "http://*/",
    "https://*/",
    "contextualIdentities",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "optional_permissions": [
    "tabHide"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{318859a8-c40c-405a-af6c-8bd1adc6ae98}"
    }
  }
}