FontSizer focuses on making small website text easier to read by adjusting font sizes. It is catalogued under Browser DevTools & extensions on PulseGate.

Who should use FontSizer?

FontSizer is a consumer product built for firefox users who need larger or more comfortable website text.

Yes — FontSizer is free to use.

What platforms does FontSizer run on?

FontSizer runs on the web, embeddable surfaces, macOS, Windows, and Linux.

Is FontSizer still active?

Unverified. FontSizer has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What projects are similar to FontSizer?

Similar projects tracked by PulseGate include Font Size Adjuster, Font Adjuster, and Font Sizer.

FontSizer is developed by Ignacio Searles.

When did FontSizer launch?

FontSizer first shipped in 2020.

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FontSizer

Name: FontSizer
Author: Ignacio Searles

mozilla.orgBrowser DevTools & extensions

FontSizer is a Firefox browser extension that lets users adjust font sizes on most websites with a slider. It is designed for people who have difficulty reading small text and supports customizable website readability.

FreeWebEmbeddablemacOSWindowsLinux

Visit mozilla.org

3alternatives

4features

2020since

Overview

4 features

In the Browser DevTools & extensions space, FontSizer takes a focused approach. It focuses on making small website text easier to read by adjusting font sizes. FontSizer is a consumer product aimed at firefox users who need larger or more comfortable website text. FontSizer is free to use. FontSizer is available on the web, embeddable surfaces, macOS, Windows, and Linux.

It is developed by Ignacio Searles, and it first shipped in 2020. Key capabilities include font size adjustment, size slider, and website-wide controls. The interface is available in 32 languages, including Czech, German, and Greek.

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

Font size adjustment
Size slider
Website-wide controls
Accessibility support

Built with & integrations

Runs on

BrowserEmbeddablemacOSWindowsLinux

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed20 Sep · 02:42 UTC
FontSizer verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about FontSizer

What is FontSizer?: FontSizer focuses on making small website text easier to read by adjusting font sizes. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use FontSizer?: FontSizer is a consumer product built for firefox users who need larger or more comfortable website text.
Is FontSizer free?: Yes — FontSizer is free to use.
What platforms does FontSizer run on?: FontSizer runs on the web, embeddable surfaces, macOS, Windows, and Linux.
Is FontSizer still active?: Unverified. FontSizer has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to FontSizer?: Similar projects tracked by PulseGate include Font Size Adjuster, Font Adjuster, and Font Sizer.Font Size Adjuster Font Adjuster Font Sizer
Who makes FontSizer?: FontSizer is developed by Ignacio Searles.
When did FontSizer launch?: FontSizer first shipped in 2020.

At a glance

Pricing: Free
Platforms: Web
First seen: 20 Sep 2026
Built for: Firefox users who need larger or more comfortable website text
Model: B2C
Solves: Making small website text easier to read by adjusting font sizes.

Registered as

Firefox Add-ons: font_sizer

Developer

Ignacio Searles

Index record

Indexed: 20 Sep 2026
Lifecycle: Alive
First seen: Sep 2026
Last seen: 20 Sep 2026

Identity audit (13)

Slug: fontsizer-mozilla-org
Lifecycle state recorded: 20 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 20 Sep 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 20 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/font_sizer

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