Examine source code of Tabs Group

{
  "manifest_version": 2,
  "version": "1.0.2",
  "name": "Tabs Group Extension",
  "short_name": "Tabs Group",
  "description": "Extension that allows you to group your tabs.",
  "author": "lambidu",
  "homepage_url": "https://github.com/lambidu/tabs-group-extension",
  "icons": {
    "16": "assets/logo/dark-16.png",
    "32": "assets/logo/dark-32.png",
    "48": "assets/logo/dark-48.png",
    "96": "assets/logo/dark-96.png",
    "128": "assets/logo/dark-128.png"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self';",
  "background": {
    "page": "index.html?page=background"
  },
  "options_ui": {
    "page": "index.html?page=settings",
    "open_in_tab": true
  },
  "browser_action": {
    "default_title": "Tabs Group Extension",
    "default_popup": "index.html?page=popup",
    "default_icon": "assets/logo/dark-32.png",
    "browser_style": true,
    "theme_icons": [
      {
        "light": "assets/logo/light-16.png",
        "dark": "assets/logo/dark-16.png",
        "size": 16
      },
      {
        "light": "assets/logo/light-24.png",
        "dark": "assets/logo/dark-24.png",
        "size": 24
      },
      {
        "light": "assets/logo/light-32.png",
        "dark": "assets/logo/dark-32.png",
        "size": 32
      },
      {
        "light": "assets/logo/light-48.png",
        "dark": "assets/logo/dark-48.png",
        "size": 48
      },
      {
        "light": "assets/logo/light-96.png",
        "dark": "assets/logo/dark-96.png",
        "size": 96
      },
      {
        "light": "assets/logo/light-128.png",
        "dark": "assets/logo/dark-128.png",
        "size": 128
      }
    ]
  }
}