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Lumo

mozilla.orgBrowser DevTools & extensions

PulseGate's liveness check found it on 29 Sep 2026; it is registered on Firefox Add-ons and has been in the index since 29 Sep 2026. How this is checked

Lumo is a Firefox browser extension that applies dark or light themes to websites using preset palettes or custom colors. It includes per-site rules, brightness and contrast controls, reading aids, scheduled activation, and settings backup and restore.

Inferred · not functionally tested

FreeWebEmbeddable
Lumo preview
Visit mozilla.org

Overview

6 features

Purpose: Making websites more comfortable and visually consistent to read in dark or light mode.

Inferred · not functionally tested

Audience: Firefox users who want customizable website themes and reading comfort tools

Inferred · not functionally tested

Functions: Unknown

Interfaces: API: unknown · MCP: unknown · CLI: unknown · Self-hosting: unknown

Recorded constraints: pricing: free · license: Proprietary · platforms: WEB · deployment: browser, embeddable

Constraint provenance is unknown; confirm requirements with the publisher.

Record sources: addons.mozilla.org · addons.mozilla.org. These links do not verify the individual claims.

Lumo sits in PulseGate's Browser DevTools & extensions category. Inferred · not functionally tested: It focuses on making websites more comfortable and visually consistent to read in dark or light mode. Inferred · not functionally tested: Lumo is a consumer product aimed at firefox users who want customizable website themes and reading comfort tools. Basis unknown · not verified: Lumo costs nothing to use. Basis unknown · not verified: It runs on the web and embeddable surfaces.

It is developed by Tron, and it first shipped in 2026. Inferred · not functionally tested: Key capabilities include dark mode, light mode, and color palettes. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

Tasks: Inferred · not functionally tested

  • Dark mode
  • Light mode
  • Color palettes
  • Custom accents
  • Brightness controls
  • Reading ruler

Topics: Inferred · not functionally tested

Tags
firefox-extensiondark-modelight-modereading-comfortcolor-customization

JSON profile · Text profile · Access guide

Built with & integrations

Runs on
BrowserEmbeddable

Trust & compliance

Public signals
HTTPSPrivacy PolicyTerms of ServiceFree tierMulti-languageStore listing found
Legal
Privacy Policy Terms of Service

Indexing history

2

What PulseGate has recorded for this listing

  1. Indexed2 Oct · 00:12 UTC
    Listing seen via seed_sitemap
    Source: seed_sitemap · Open
  2. Indexed29 Sep · 00:24 UTC
    Lumo: Dunkel- & Hellmodus seen via Firefox Add-ons
    Source: Firefox Add-ons · Open

Frequently asked questions about Lumo

What is Lumo?
Inferred · not functionally tested: Lumo focuses on making websites more comfortable and visually consistent to read in dark or light mode. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use Lumo?
Inferred · not functionally tested: Lumo is a consumer product built for firefox users who want customizable website themes and reading comfort tools.
Is Lumo free?
Basis unknown · not verified: Yes — Lumo is free to use.
What platforms does Lumo run on?
Basis unknown · not verified: Lumo runs on the web and embeddable surfaces.
Is Lumo still active?
PulseGate's liveness check found it on 29 Sep 2026.
What projects are similar to Lumo?
Similar projects tracked by PulseGate include Lumino Dark Mode, Lumen, and Moodle Dark Mode.Lumino Dark ModeLumenMoodle Dark Mode
Who develops Lumo?
Lumo is developed by Tron.
When did Lumo launch?
Lumo first shipped in 2026.

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