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Firefox Portable
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Firefox Portable

  -  160.4 MB  -  Open Source
Free Download

Security Status

  • Latest Version

    Firefox Portable 142.0 LATEST

  • Review by

    Juan Garcia

  • Operating System

    Windows 10 / Windows 11

  • User Rating

    Click to vote

  • Author / Product

    John T. Haller / External Link

  • Filename

    FirefoxPortable_142.0_English.paf.exe

  • MD5 Checksum

    8b4437b18dff25f79d616ab85874fa1c

Firefox Portable is a fully functional version of the Mozilla Firefox web browser designed to run without installation.

Developed by PortableApps.com in collaboration with Mozilla, this portable version allows users to carry their favorite browser on a USB drive or cloud storage and run it on any Windows PC without leaving behind personal data.



It retains all the features of the standard Firefox, including enhanced security, privacy settings, and add-on support, while ensuring portability and ease of use.

Key Features

Portability – Runs from a USB stick or cloud storage without installation.

Full Firefox Experience – Supports add-ons, themes, and developer tools.

Privacy & Security – Includes tracking protection, private browsing mode, and security updates.

Automatic Updates – Keeps the browser up to date when used on an internet-connected PC.

Data Persistence – Saves bookmarks, history, and extensions between sessions.

Customizability – Supports UI customization with themes and extensions.

Cross-Platform Syncing – Integrates with a Firefox account for syncing bookmarks, history, and passwords.

Open-Source & Free – Offers transparency and security with an open-source codebase.

User Interface

Firefox Portable retains the same clean and customizable interface as the regular desktop version.

The UI consists of a minimalist design with a tabbed browsing layout, an address bar with integrated search, and a customizable toolbar.

Users can personalize their experience with themes and extensions, making it easy to create a tailored browsing experience.

Installation and Setup

Download – Visit the PortableApps website or FileHorse.com and download the latest Firefox Portable 32/64bit package.

Extract Files – Run the downloaded file and extract it to a USB drive or a folder on your PC.

Run the Browser – Open the folder and launch FirefoxPortable.exe.

Customize Settings – Configure extensions, privacy settings, and preferences as needed.

How to Use
  • Launch FirefoxPortable.exe from the extracted folder.
  • Browse as usual, with bookmarks, history, and extensions saving to the portable directory.
  • To update, download the latest version and replace the old files while keeping your personal data.
  • For privacy, delete the "profile" folder if you wish to reset all settings.
FAQs

Is Firefox Portable different from the standard Firefox?
No, it offers the same features but is designed to run without installation.

Can I sync my bookmarks and passwords?
Yes, by signing into a Firefox account, you can sync browsing data across devices.

Does it update automatically?
Yes, but you must have an internet connection and manually download updates from PortableApps.

Can I run Firefox Portable on macOS or Linux?
No, it is designed for Windows, but you can use regular Firefox on macOS and Linux.

Will Firefox Portable leave traces on a computer?
No, it is designed to be self-contained and does not leave browsing history or settings on the host machine.

Alternatives

Google Chrome Portable – Similar portability but requires a Google account for full functionality.

Opera Portable – Offers built-in VPN and social media integration.

Brave Portable – Privacy-focused with ad-blocking and built-in Tor browsing.

Tor Browser Portable – Best for anonymous browsing with enhanced privacy features.

System Requirements
  • OS: Windows 7, 8, 10, 11 (32-bit or 64-bit)
  • Processor: Intel/AMD 1 GHz or faster
  • RAM: 512MB (1GB+ recommended)
  • Storage: 200MB free space (additional for cache and downloads)
  • Internet: Required for updates and cloud syncing
PROS
  • Does not require installation
  • Fully functional with all Firefox features
  • Leaves no traces on the host computer
  • Supports extensions, themes, and customization
  • Free and open-source
CONS
  • Updates must be manually downloaded
  • Performance may be slower on USB drives
  • Limited to Windows (no macOS or Linux support)
  • No official Mozilla support for the portable version
  • May have compatibility issues with certain extensions
Conclusion

Firefox Portable is an excellent choice for users who need a lightweight, privacy-focused browser that can be carried on a USB drive or cloud storage. It delivers the full Firefox experience without installation, making it perfect for students, professionals, and anyone who uses multiple computers.

While it has minor limitations, such as manual updates and slower performance on USB drives, its flexibility and security make it one of the best portable web browsers available.

Note: Its support for Windows XP and Windows Vista is still available through Firefox ESR (Extended Support Release). Download Firefox for Windows XP or Vista.

Also Available: Download Firefox for Mac

Download Firefox Portable Latest Version
Why is this app published on FileHorse? (More info)

  • Firefox Portable 142.0 Screenshots

    The images below have been resized. Click on them to view the screenshots in full size.

    Firefox Portable 142.0 Screenshot 1
  • Firefox Portable 142.0 Screenshot 2
  • Firefox Portable 142.0 Screenshot 3
  • Firefox Portable 142.0 Screenshot 4
  • Firefox Portable 142.0 Screenshot 5

What's new in this version:

New:
- For users in the United States, article recommendations on your New Tab page are now grouped into topic sections like Sports, Food, and Entertainment to make stories more organized and easier to scan. You can also follow topics you’re interested in and block ones you’d prefer not to see, giving you more control over what shows up when you open a new tab.
- You can now see what’s behind a link before visiting it with Link Previews. Long press a link (or right-click and choose Preview Link). Previews can optionally include AI-generated key points, which are processed on your device to protect your privacy.
- Link Previews is gradually rolling out to ensure performance and quality and is now available in en-US, en-CA, en-GB, en-AU for users with more than 3 GB of available RAM
- On Windows, clicking a persistent notification when Firefox is closed or restarted will now properly open Firefox with the relevant webpage, instead of just opening the main page of the website.
- ETP Strict mode now supports a flexible exception list to fix broken site features caused by tracker blocking. Exceptions are split into baseline (core functionality) and convenience (extra features), letting users choose improved site compatibility without compromising key privacy protections.
- Keep an active tab visible in a collapsed tab group
- Focus on just one tab in a group without the clutter. Your active tab stays in view, keeping things tidy even with the group collapsed.
- You can now remove extensions from the sidebar by right-clicking the extension icon and selecting Remove from Sidebar.

Fixed:
- Improved the scroll speed in the bookmarks dialog to not go beyond the component area.
- Improved drag-and-drop support for blob images.

Various security fixes:
- CVE-2025-9179: Sandbox escape due to invalid pointer in the Audio/Video: GMP component
- CVE-2025-9180: Same-origin policy bypass in the Graphics: Canvas2D component
- CVE-2025-9181: Uninitialized memory in the JavaScript Engine component
- CVE-2025-9182: Denial-of-service due to out-of-memory in the Graphics: WebRender component
- CVE-2025-9183: Spoofing issue in the Address Bar component
- CVE-2025-9187: Memory safety bugs fixed in Firefox 142 and Thunderbird 142
- CVE-2025-9184: Memory safety bugs fixed in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142
- CVE-2025-9185: Memory safety bugs fixed in Firefox ESR 115.27, Firefox ESR 128.14, Thunderbird ESR 128.14, Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142

Changed:
- Improved search results from browsing history via the address bar, reducing the likelihood of duplicate results being shown.
- Improved Netmonitor so that Request Headers/Cookies/Params are displayed in the Network panel even if the request isn't finished yet.

Enterprise:
Policies:
- The Permissions policy has been updated to allow you to configure permissions for screen sharing
- The EnableTrackingProtection policy has been updated to allow you to set the category to either strict or standard. When the category is set using this policy, the user cannot change it.
- The EnableTrackingProtection policy has been updated to allow you to set control Suspected fingerprinters. For more information

Special Notes:
- There is one more planned release of Firefox 128 ESR, and then it will go out of support on September 16, 2025. Users will then be automatically upgraded to Firefox 140 ESR.
- If you need to prevent upgrades for any reason, you can use the AppUpdatePin policy.

Developer:
- Firefox now supports the wllama API for extensions, enabling developers to integrate local language model (LLM) capabilities directly into their add-ons
- The Debugger now offers a new setting to control whether the debugger overlay is shown during paused script execution
- Firefox now supports the Prioritized Task Scheduling API, enabling developers to assign and manage task priorities
- The Selection.getComposedRanges() API is now available, allowing developers to accurately get selected text ranges across shadow DOM boundaries
- Added support for the URLPattern API, enabling developers to match and parse URLs using a standardized pattern syntax

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