Examine source code of Keypirinha Tab Switcher

{
  "manifest_version": 2,
  "name": "Keypirinha Tab Switcher",
  "version": "1.0",
  "description": "Used by Keypirinha plugin to switch to open tab.",
  "background": {
    "scripts": [
      "redirect.js"
    ],
    "persistent": false
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a392eb25-7c48-4b75-9fea-10a421e19211}"
    }
  }
}