Firefox Browser Add-ons
  • Extensions
  • Themes
    • for Firefox
    • Dictionaries & Language Packs
Log in
Preview of Lights Out: Dark Theme

Lights Out: Dark Theme by WHYZEE

Turn light websites dark with smart, adjustable dark mode.

0 (0 reviews)0 (0 reviews)
Download Firefox and get the extension
Download file

Extension Metadata

About this extension
🌙 Lights Out turns bright websites into comfortable dark pages in one click.

✨ Smart mode remaps each element’s colors and keeps every site’s brand hues, so pages look designed for the dark instead of inverted.
⚡ Simple mode inverts the whole page for maximum speed on sites that resist Smart mode.
🎚 Fine-tune brightness, contrast, and warmth to match your eyes.
🖼 Images and photos stay untouched by default, with an optional dim setting.
🛡 Keep favorite sites light with an allowlist that covers subdomains too.
⌨ Toggle instantly with Alt + Shift + L.
🎨 Modern settings with a dark or light interface.
🔒 Private by design: no data collected, no accounts, no tracking, no remote code.

Works on news sites, docs, forums, dashboards, and more. Sites that already support dark mode are left alone.

Found a page that looks off? Open the popup, switch to Simple mode, or add the site to your keep-light list. Feedback is always welcome.
Rated 0 by 0 reviewers
Log in to rate this extension
There are no ratings yet

Star rating saved

5
0
4
0
3
0
2
0
1
0
No reviews yet
Permissions and data

Required permissions:

  • Access your data for all websites

Data collection:

  • The developer says this extension doesn't require data collection.
Learn more
More information
Add-on Links
  • Copy add-on ID
Version
1.0.1
Size
768.16 KB
Last updated
12 days ago (Oct 21, 2026)
Related Categories
  • Appearance
License
All Rights Reserved
Version History
  • See all versions
Add to collection
Report this add-on
Go to Mozilla's homepage

Add-ons

  • About
  • Firefox Add-ons Blog
  • Extension Workshop
  • Developer Hub
  • Developer Policies
  • Community Blog
  • Forum
  • Report a bug
  • Review Guide

Download

  • Download Firefox
  • Windows
  • macOS
  • iOS
  • Android
  • Linux
  • All

Latest Builds

  • Nightly
  • Beta

Firefox for Business

  • Enterprise

Community

  • Connect
  • Contribute
  • Developer

Follow

  • Instagram
  • YouTube
  • TikTok
  • Bluesky
  • Podcast
  • Privacy
  • Cookies
  • Legal

Except where otherwise noted, content on this site is licensed under the Creative Commons Attribution Share-Alike License v3.0 or any later version.