Features & Capabilities

Font Contrast is a free and open-source Chrome extension designed to improve the readability of webpages. It combats the trend of hard-to-read text on websites by turning light or faint text to black or darker shades, enlarging small fonts, and increasing font boldness for better clarity. The extension is lightweight and efficient, ensuring smooth performance even on large websites.

Users can easily toggle the readability enhancements via the icon or a convenient keyboard shortcut (default: Shift+F1). Additionally, it provides an address bar button to quickly customize settings for specific websites. This program is released under the GNU General Public License v3.0, making it not only free to use but also open for contributions and modifications. For users who find Font Contrast helpful, there is an option to support its development via donations.

User Growth & Download Statistics

Manifest V2 Add-on Accessibility Open Source
By:
Francesco Fusco
Daily users:
841 -3
Rating:
4.38
(88)
Version:
1.6.1 Last updated: 2024-01-14
Version code:
5677339
Creation date:
2017-07-29
Risk:
High risk impact Low risk likelihood
Permissions:
Size:
198.24KB
Full description:
See detailed description
Source:
Firefox Add-ons Store
Data ingested on:
2026-06-19
Compare stats and ranking:

Other platforms

Chrome
Font Contrast (v1.6.6)
572 4.17 (6)
Edge
Font Contrast (v1.6.6)
147 5.00 (1)

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.
Developed by:
Francesco Fusco
Firefox Add-ons Store
https://addons.mozilla.org/firefox/addon/font-contrast-fix/

User Reviews

Font Contrast is praised for greatly improving text readability on many sites and offering strong per-site customization, which helps users with visual impairments. It remains effective when properly configured and provides a handy toolbar toggle. However, reports of media blocking on some sites and a hard-to-see icon on dark themes indicate reliability/UI quirks. Overall, its value depends on careful setup and site compatibility, but it can be a powerful accessibility/readability tool when it works well.
Pros
  • Significantly improves readability by increasing contrast on low-contrast sites, reducing eye strain.
  • Accessibility benefits for users with visual impairments (e.g., achromatopsia, macular degeneration).
  • Highly configurable with per-site options (blacklist, font-size adjustments) for fine-tuning across websites.
  • Convenient UX features, including a toolbar toggle for quick on/off and reliable performance once configured.
Cons
  • Occasional blocking of images or videos on certain sites (disrupts site functionality).
  • Icon visibility issues on dark themes (the extension icon can be hard to see or invisible).
Recent reviews
by Fi*****, 2026-04-18

Font Contrast only applies Bold text on most sites only, nothing else. None of the contrast, color, brightness, or opacity features work. Websites especially those who use closed shadow‑DOM components, CSS variables for all text colors, and !important rules that the extension can’t override. The result is consistent: bold works, everything else does nothing. This extension has many limitations at the root level and in how the extension handles shadow‑DOM and variable‑based color systems. A fix would require support for rewriting CSS variables and penetrating closed shadow roots Instructions are written by an NPC written for an AI or bot. Extension doesn't play nice if you have other extensions like uBlock or VPNs and more. It needs a major update. You need to know how to tweak your settings. Otherwise, the default settings don't do much. It needs a toggle to see changes with and without as you change the settings. It's funny how there are many Chromium extensions that do this job well, but only this one claims to adjust the contrast fonts. Clearly Mozilla's marketshare is dropping fast and developers want no part of it. If F. Fusco, the developers spends a bit more time providing instructions and updating his guide which is not current it could be a "game changer". But it looks like it's abandoned.
by Wh*****, 2026-04-11

Works for me, but kills my usercontent settings for link colors, even if setting "ignore colorful text" is enabled.
by sd*****, 2026-03-12
View all user reviews ›

Is Font Contrast Safe?

Risk impact
Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Font Contrast requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details
  • Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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Risk likelihood
Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Font Contrast has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details
  • High This extension has low user count. Unpopular extensions may not be stable or safe.
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