YouTube Customizer
ThemesChrome Extension

The Black Cat - Dark Themes For WebSites

Bright white interfaces strain your eyes during long sessions on YouTube, Gmail, or Reddit. The Black Cat - Dark Themes For WebSites injects bundled dark CSS tuned for each supported domain.

Enable or disable theming from the popup, add sites to a blacklist when you need the original look, and turn on the night tint overlay for warmer late-night browsing.

Version 1.0.9 (January 5, 2026). Featured on the Chrome Web Store with 803+ users.

Screenshots

Chrome Web Store preview images for The Black Cat - Dark Themes For WebSites

The Black Cat - Dark Themes For WebSites screenshot 1
The Black Cat - Dark Themes For WebSites screenshot 2
The Black Cat - Dark Themes For WebSites screenshot 3
The Black Cat - Dark Themes For WebSites screenshot 4
Key features
What this extension adds to YouTube
  • Dark themes for YouTube, Gmail, Reddit, GitHub, Twitter, and 30+ popular sites
  • Per-site blacklist to skip theming on selected domains
  • Optional night tint overlay with adjustable warmth and intensity
  • 54-language popup UI via Chrome i18n

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