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The browser is the single most-used piece of software on most people’s computers, which makes its licensing, privacy defaults, and extension ecosystem matter more than almost any other application choice. Open source browsers let you (or a community of auditors) actually verify what the browser does with your data, rather than trusting a vendor’s privacy policy.

Firefox remains the most widely used independent, open source browser engine outside the Chromium family. LibreWolf is a hardened, privacy-focused Firefox fork with tracking protection enabled by default. Tor Browser routes traffic through the Tor network for strong anonymity. Brave is Chromium-based with open source code and built-in ad/tracker blocking.

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Popular Open Source Web Browsers

Brave

Privacy-focused browser with built-in ad and tracker blocking

Brave is a free, open source browser built on Chromium that blocks ads and trackers by default, offering Chrome-level compatibility with stronger privacy.

Open Source MPL-2.0

Firefox

Independent, open source web browser

Firefox is a free, open source web browser developed by the Mozilla Foundation, built on its own Gecko engine and offering strong privacy controls as an alternative to Chromium-based browsers.

Open Source MPL-2.0

LibreWolf

Privacy-hardened fork of Firefox

LibreWolf is a free, open source Firefox fork that strips telemetry and data-sharing partnerships, applying privacy-hardened defaults and uBlock Origin.

Open Source MPL-2.0

Tor Browser

Anonymous browsing through the Tor network

Tor Browser is a free, open source Firefox ESR fork maintained by The Tor Project that routes traffic through the Tor network for anonymous, censorship-resistant browsing.

Open Source MPL-2.0