Mozilla Firefox 138.0
Latest version • Updated May 2026
Mozilla Firefox 138.0 is a fast, secure, and privacy-focused open-source web browser. It blocks trackers by default, offers enhanced anti-fingerprinting protection, and gives you full control over your data. With excellent extension support, built-in password manager, dark mode, picture-in-picture, and seamless synchronization across all devices, Firefox remains one of the best choices for users who value speed, privacy, and independence from big tech companies.
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About Mozilla Firefox
Mozilla Firefox is a fast, secure, and privacy-focused web browser developed by the non-profit Mozilla Foundation. It is one of the few major browsers that is completely open-source and truly independent, without selling user data to advertisers.
Firefox stands out for its strong emphasis on user privacy. It blocks trackers by default, offers Enhanced Tracking Protection, Container Tabs, and anti-fingerprinting technologies. At the same time, it delivers excellent performance, modern design, and a huge library of extensions, making it a favorite choice for millions of users worldwide who value speed and privacy.
In version 138.0 (May 2026), Firefox received major improvements in speed, better memory management, enhanced Picture-in-Picture mode, improved password manager, and stronger protection against harmful websites. It continues to be actively developed with frequent updates and remains one of the most respected browsers in the open-source community.
Whether you are a regular user, developer, or privacy enthusiast, Firefox offers the perfect balance between performance, security, and customization without compromising your personal data.
Key Features
- Built-in Enhanced Tracking Protection that automatically blocks trackers and harmful scripts
- Container Tabs for isolating websites and improving privacy
- Picture-in-Picture video mode for watching videos while browsing
- Hardware acceleration and excellent performance on all platforms
- Thousands of extensions and themes available in the official add-ons store
- Seamless Sync across Windows, macOS, Linux, Android, and iOS devices
- Built-in password manager with autofill and breach alerts
- Dark mode and highly customizable user interface
- PDF viewer, screenshot tool, and reader mode for clean article reading
- Regular security updates and fast release cycle
System Requirements
Mozilla Firefox 138.0 is well optimized and runs smoothly on both modern and older computers. It has relatively modest system requirements compared to other modern browsers, making it a good choice even for lower-end devices.
- Windows 10 / Windows 11 (64-bit recommended)
- macOS 12 Monterey or newer
- Most modern Linux distributions
- 2 GB RAM minimum (4 GB or more recommended for smooth multitasking)
- 500 MB free disk space
- Internet connection for initial download and updates
Alternatives to Firefox
If you are looking for other web browsers in 2026, here are the most popular alternatives to Mozilla Firefox. Each browser has its own strengths depending on whether you prioritize privacy, speed, or compatibility.
- Brave — privacy-focused browser with built-in ad blocker, tracker protection, and crypto rewards system
- Mullvad Browser — maximum privacy and anti-fingerprinting protection (based on Firefox)
- Google Chrome — the most popular browser with the largest extension ecosystem
- Microsoft Edge — excellent performance, vertical tabs, and deep Windows integration
- LibreWolf — privacy-hardened version of Firefox with many tracking protections enabled by default