Examine source code of Vertical Tabs Reloaded

{
  "name": "Vertical Tabs Reloaded",
  "short_name": "VTR",
  "description": "This Firefox add-on arranges tabs in a vertical rather than horizontal fashion.",
  "version": "0.13.1",
  "manifest_version": 2,
  "author": "Michael 'Croydon' Keck",
  "developer": {
    "name": "Michael 'Croydon' Keck"
  },
  "homepage_url": "https://github.com/Croydon/vertical-tabs-reloaded",
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "unlimitedStorage",
    "sessions",
    "bookmarks"
  ],
  "incognito": "spanning",
  "background": {
    "scripts": [
      "utils/namespace.js",
      "utils/log.js",
      "utils/options.js",
      "utils/time.js",
      "utils/windows.js",
      "index.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "sidebar_action": {
    "default_title": "Vertical Tabs Reloaded",
    "default_icon": "data/icon-16.png",
    "default_panel": "vtr.html",
    "browser_style": true
  },
  "browser_action": {
    "default_icon": {
      "16": "data/icon-16.png",
      "48": "data/icon.png",
      "96": "data/icon-96.png",
      "128": "data/icon-128.png"
    },
    "theme_icons": [
      {
        "light": "data/icon/icon-16-white.png",
        "dark": "data/icon-16.png",
        "size": 16
      },
      {
        "light": "data/icon/icon-32-white.png",
        "dark": "data/icon-32.png",
        "size": 32
      }
    ],
    "default_title": "Toggle Tab Sidebar",
    "browser_style": true
  },
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+V"
      },
      "description": "Hotkey for showing/hiding the tab sidebar"
    }
  },
  "icons": {
    "16": "data/icon-16.png",
    "48": "data/icon.png",
    "96": "data/icon-96.png",
    "128": "data/icon-128.png"
  },
  "minimum_opera_version": "57.0",
  "applications": {
    "gecko": {
      "id": "verticaltabsreloaded@go-dev.de",
      "strict_min_version": "60.0"
    }
  }
}