Examine source code of Tabulator Grinder

{
  "manifest_version": 2,
  "name": "Tabulator Grinder",
  "version": "2.13",
  "author": "Jonas Focke",
  "description": "Manages open tabs by closing forgotten ones and freeing system resources.",
  "homepage_url": "https://github.com/JonasFocke01/Tabulator-Grinder",
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "menus",
    "storage",
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e3d5a6b9-488e-4f91-8991-df80456ee466}",
      "strict_min_version": "57.0"
    }
  },
  "icons": {
    "48": "icons/default.png"
  },
  "browser_action": {
    "default_icon": "icons/default.png",
    "default_title": "Tabulator Grinder",
    "default_popup": "options.html"
  }
}