Examine source code of Tab queue

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/tab-queue.svg",
    "theme_icons": [
      {
        "light": "icons/tab-queue.svg",
        "dark": "icons/tab-queue.svg",
        "size": 48
      }
    ],
    "browser_style": true,
    "default_title": "Tab queue",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "option/option.html",
    "browser_style": true
  },
  "icons": {
    "48": "icons/tab-queue.svg",
    "96": "icons/tab-queue.svg"
  },
  "description": "Add links to queue and open them progressively",
  "homepage_url": "https://example.com/",
  "manifest_version": 2,
  "name": "Tab queue",
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "contextMenus",
    "webNavigation"
  ],
  "version": "1.3.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{bf3d89ab-6ef6-494b-9cf1-e6176063f914}"
    }
  }
}