Compare: JShelter vs Font Fingerprint Defender

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Metric	JShelter	Font Fingerprint Defender
User count	10,000	100,000
Average rating	4.50	3.54
Rating count	34	24
Last updated	2026-07-04	2026-05-29
Size	0.54 MB	0.05 MB
Version	0.24.1	0.1.7

Short description	Protect your browser from fingerprinting and malicious JavaScript. JShelter controls and restricts browser APIs to reduce tracking and data leaks.	Hide your real font fingerprint with Font Fingerprint Defender. Randomizes font data to enhance your online privacy effortlessly.
Full summary	JShelter is a browser extension that returns control over JavaScript-driven behavior to the user. Acting like a firewall for browser APIs, it lets you allow, block, or restrict access to sensitive browser capabilities to prevent fingerprinting, tracking, and unwanted data leakage. JShelter can also reduce precision for features like geolocation and apply safeguards against attacks targeting the browser, OS, or hardware. Beyond blocking, JShelter helps you learn how pages call JavaScript APIs with its Fingerprint Detector and exportable JSON reports. The project provides documentation, a threat model, and a research paper for deeper understanding (see the FAQ and blog on jshelter.org and the arXiv paper). Use JShelter to harden your browsing privacy and security while retaining per-site control over what web pages can access.	Font Fingerprint Defender is a lightweight Chrome extension designed to protect your online privacy by disguising your real font fingerprint. Instead of blocking fingerprinting entirely, it reports a random fake font fingerprint value each time you reload or visit a website, adding subtle noise to the actual fingerprint. This extension requires no configuration—simply install it and start browsing securely. It's especially useful on sites that track users via font fingerprinting, offering a dynamic, constantly changing identity to keep your browsing habits private. Developed alongside the creator of Canvas Fingerprint Defender, Font Fingerprint Defender renews your font fingerprint automatically, enhancing your protection against online tracking.