ThemeRatio by RatioWorks

ThemeRatio is a lightweight Firefox theme and color optimizer designed to make Firefox more visually flexible while keeping setup simple.

Choose from browser-inspired color styles including Safari, Chrome, Edge, Firefox, Brave, Opera, Opera GX, Arc, Vivaldi, Zen, Floorp, Orion, Graphite, and custom ThemeRatio styles.

Features include:

• Browser-inspired dark and light color profiles
• Custom one-color theme generation
• Vibrant Custom theme mode
• Optional adaptive website color matching
• Elegant, Balanced, Vibrant, and Bold site-color modes
• Accent-only, toolbar, or full-theme website coloring
• Adjustable color strength, vibrance, and brightness
• Automatic contrast and readability protection
• Custom base and accent colors
• Per-site exclusions
• Live theme preview
• Local settings storage
• Optional website permission only when site-color features are enabled

ThemeRatio uses Firefox's native theme APIs. It does not replace webpage content, inject advertising, use analytics, or require a native desktop helper.

Website color detection is optional. When enabled, ThemeRatio analyzes visual theme colors locally in Firefox to generate a matching browser theme. ThemeRatio does not transmit browsing data, website colors, hostnames, settings, or telemetry to external servers.