Examine source code of Tab Switch

{
  "name": "__MSG_extensionName__",
  "author": "Florian Schroevers",
  "homepage_url": "https://github.com/FlorianSchroevers/tabswitch",
  "description": "__MSG_extensionDescription__",
  "manifest_version": 2,
  "default_locale": "en",
  "version": "1.4.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{95a91cd3-346f-4312-b011-0d24d841e981}",
      "strict_min_version": "58.0"
    }
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "next-tab": {
      "suggested_key": {
        "default": "Ctrl+Left"
      },
      "description": "__MSG_extensionPrevTabDescription__"
    },
    "previous-tab": {
      "suggested_key": {
        "default": "Ctrl+Right"
      },
      "description": "__MSG_extensionNextTabDescription__"
    }
  },
  "options_ui": {
    "page": "settings/options.html",
    "browser_style": true
  },
  "browser_action": {
    "default_title": "Tab Switch Settings"
  }
}