By FreePortal Team · Reviewed by FreePortal Editorial Team · Last updated October 2026

How to Download and Install Mozilla Firefox Free Guide

The free, open-source browser built by a non-profit — fast, private, and the last major browser that still runs full uBlock Origin.

Visit Official Site →

Is Firefox Free?

Yes. Firefox is free and open source, developed by the non-profit Mozilla Foundation. There is no paid tier, no subscription, and no account requirement. Mozilla makes money through search partnerships (default search engine deals), not by selling user data or charging for the browser.

An optional free Mozilla account enables sync of bookmarks, tabs, passwords, and history across devices — but it is entirely optional and requires no payment.

System Requirements

OS: Windows 10 or later (32-bit and 64-bit), macOS 10.15 (Catalina) or later, or most modern 64-bit Linux distributions
Processor: Any modern 64-bit CPU (Pentium 4 or newer with SSE2 for the 32-bit build)
RAM: 1 GB for the 32-bit build; 2 GB for the 64-bit build (most users download the 64-bit installer)
Storage: 500 MB free hard drive space
Note: No account is required to download or use Firefox — a Mozilla account is only needed for sync across devices. Users on Windows 7/8 or older macOS should use Firefox ESR 115, supported until at least March 2027.

How to Install Firefox

Go to the official site. Visit mozilla.org/firefox. Mozilla is the only official source — avoid third-party "Firefox download" sites, which often bundle adware.
Download the installer. The page auto-detects your OS. Click Download Firefox — it's a small, free download with no account required.
Run the installer. Open the downloaded file and follow the prompts. Default options are fine for most users.
Launch Firefox. Open it from your Start menu or Applications folder.

Getting Started

Import your data. On first launch Firefox offers to bring over bookmarks, history, and passwords from Chrome or Edge — accepting saves you from re-entering everything.
Set it as your default browser. Firefox asks on first run. If you skip it, go to Settings → General → Default Browser and click "Make Default".
Turn on Strict tracking protection. Open Settings → Privacy & Security and set Enhanced Tracking Protection to Strict. This blocks cross-site trackers, fingerprinters, cryptominers, and bounce trackers, and enables Enhanced Cookie Clearing — a genuine upgrade over the default.
Sign in to sync (optional). Create a free Mozilla account to sync bookmarks, tabs, passwords, and history across desktop and the mobile app.
Install a couple of extensions. Click the puzzle-piece icon in the toolbar to open the Add-ons Manager, or press Ctrl+Shift+A.

Useful Tips

🛡️ Strict mode is the single best setting. Enhanced Tracking Protection on Strict blocks most cross-site tracking out of the box — no extension required. It also turns on Bounce Tracking Protection and Enhanced Cookie Clearing.
🧩 Install full uBlock Origin. Firefox is now the only major browser that still runs the full uBlock Origin extension. Chrome finished removing Manifest V2 extensions in 2026, and Edge is now following. If a full-strength content blocker matters to you, Firefox is the practical choice.
📖 Reader View is built in. Press F9 on any article to strip out ads, sidebars, and clutter, leaving clean text you can adjust the font size on.
📸 Firefox Screenshots. Press Ctrl+Shift+S (Cmd+Shift+S on Mac) to capture a region, full page, or single element — save or share without leaving the browser.
🗂️ Use Multi-Account Containers. Mozilla's own extension keeps work, shopping, and personal logins in isolated tab containers so sites can't link your identities together.
📄 The PDF viewer is built in. No plug-in needed — Firefox opens, fills, and annotates PDFs natively, and you can save your notes back into the file.
⌨️ Reopen a closed tab. Ctrl+Shift+T restores the last tab you closed, and keeps working for the last several tabs you shut by mistake.
⚡ Check hardware acceleration. If video feels choppy, open Settings → General → Performance and make sure "Use hardware acceleration when available" is ticked.
🏢 Consider ESR for stability. If you manage devices or dislike frequent feature changes, Firefox ESR 153.5.1 gets security fixes without UI churn. On Windows 7/8 or macOS 10.14 or older, ESR 115 is the only supported option through March 2027.

Firefox vs Chrome vs Edge vs Brave

Firefox: The only major browser not based on Chromium. Built by the non-profit Mozilla. Strict tracking protection out of the box, full uBlock Origin support, and no data monetisation. Best for users who want independence from Google's rendering engine and a browser that still supports full-strength content blocking.
Chrome: Google's browser, largest market share and best site compatibility. Fast and deeply integrated with Google services, but collects more data by default and has completed its Manifest V3 transition, which restricts full uBlock Origin. Best for users already deep in the Google ecosystem.
Edge: Microsoft's Chromium-based browser, tightly integrated with Windows and Microsoft 365. Free and reasonably private, but pushes Microsoft services aggressively and is now retiring Manifest V2, so full uBO support is ending here too. Best for Windows users who want Chromium compatibility without Chrome's Google focus.
Brave: Chromium-based, strong privacy defaults, and a built-in ad blocker plus optional crypto rewards programme. Independent tests often rank Brave highest on default fingerprinting protection. Best for users who want Chromium compatibility with stronger privacy defaults than Chrome or Edge.

For most users, Firefox is the strongest choice for privacy, independence, and full ad-blocker support. Chrome and Edge are pragmatic if you rely on Google or Microsoft services. Brave is a strong alternative if you want Chromium compatibility with privacy at the core — but note that its blocker is built-in rather than uBlock Origin.

Troubleshooting Common Issues

🐌 Firefox is slow or uses high CPU. Open about:performance to see which tab or extension is responsible. If it is a specific site, try toggling tracking protection off for that site (the shield icon in the address bar).
🌐 A site loads incorrectly. Click the shield icon → toggle Enhanced Tracking Protection off for that site. If the site still breaks, try Firefox's Troubleshoot Mode (Help → Troubleshoot Mode) to test with extensions disabled.
🔒 "Your connection is not secure" error. Usually a system clock issue (TLS certificates require accurate time), or a corporate proxy intercepting HTTPS. Check your system clock first; if it is correct and the error persists at work, ask IT.
💾 Downloads blocked as "potentially unsafe". Firefox blocks some file types (like .exe) by default. Right-click the download entry → "Allow Download" to unblock — but only if you trust the source.
🔐 Saved passwords not filling in. Check Settings → Privacy & Security → Logins and Passwords — the site may be in the "Exceptions" list. If Firefox is set to "Never remember passwords", toggle it to "Ask to save logins".
🧩 Extensions stopped working. Firefox occasionally disables extensions for security or compatibility reasons. Open about:addons to see the reason and re-enable — or update the extension from its official page.
🪟 Firefox won't install on Windows 7/8. Current Firefox requires Windows 10 or later. Use Firefox ESR 115, which remains supported on Windows 7/8 until at least March 2027.

Frequently Asked Questions

Is Firefox more private than Chrome?

Yes, by default. Firefox includes Enhanced Tracking Protection that blocks cross-site trackers, fingerprinters, and cryptominers out of the box, and Strict mode adds Bounce Tracking Protection (which stops redirect-tracker chains) and Enhanced Cookie Clearing. Chrome offers less native protection and still tracks browsing by default. Independent 2026 comparisons consistently rank Firefox ahead of Chrome on native privacy, though Brave scores highest on raw default blocking.

Can I use Chrome extensions in Firefox?

Mostly yes. Firefox supports the WebExtensions API that Chrome extensions use, and most popular extensions (uBlock Origin, Bitwarden, Dark Reader, Privacy Badger) have Firefox versions. Some Chrome-exclusive extensions with heavy native integration may not work.

Does Firefox sync across devices?

Yes, with a free Mozilla account. Sync covers bookmarks, tabs, passwords, history, and open tabs across desktop and the Firefox mobile app. The account is free and does not require any payment.

Is Firefox faster than Chrome?

For most sites, the two are comparable. Firefox’s Quantum engine brought major performance gains, and Firefox often uses less RAM with many tabs open. Chrome sometimes edges ahead on JavaScript-heavy web apps. Real-world difference is small — try both if performance is your main concern.

What is Enhanced Tracking Protection on Strict mode?

Strict mode is Firefox’s strongest anti-tracking setting. It blocks cross-site cookies, fingerprinters, cryptominers, social media trackers, and known trackers; it also enables Bounce Tracking Protection (blocking redirect-based tracking) and Enhanced Cookie Clearing, and strips tracking parameters from URLs. Some sites that rely on third-party scripts may break in Strict mode, in which case you can toggle protection off for that site only.

Does Firefox work on Mac and Linux?

Yes. Firefox runs on Windows 10+, macOS 10.15+, and most modern Linux distributions, including via Flatpak and Snap packages. The mobile app runs on iOS and Android.

What is Firefox ESR?

ESR (Extended Support Release) is a slower-moving Firefox branch that gets security updates but not new features — useful for managed IT environments and anyone who values stability. The current ESR is 153.5.1 (October 2026). ESR 115 remains the only supported build for Windows 7/8 and older macOS, with support guaranteed until at least March 2027.

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