Examine source code of MaxTabsLimit

{
  "description": "Limit the number of tabs that can be opened",
  "homepage_url": "https://github.com/gebirgsbaerbel/max-tabs-limit",
  "manifest_version": 2,
  "name": "MaxTabsLimit",
  "permissions": [
    "tabs",
    "notifications",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "32": "tab.svg"
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Max Tabs Limit",
    "default_icon": {
      "32": "tab.svg"
    }
  },
  "version": "1.23",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "57.0a1",
      "id": "{153bfe4b-bb31-4715-8144-d62d516485a9}"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "chrome_style": true
  }
}