Examine source code of TabAutoCloseAndRefresh

{
  "manifest_version": 2,
  "name": "TabAutoCloseAndRefresh",
  "version": "1.0.1",
  "description": "Firefox extension for auto closing tabs that meet certain criteria.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "closeTab.js"
    ]
  },
  "browser_action": {
    "default_title": "TabAutoCloseAndRefresh"
  },
  "homepage_url": "https://github.com/mobislan/TabAutoClose",
  "options_ui": {
    "page": "settings.html"
  }
}