Firefox Browser Review 2026: Features, Privacy and Tabs

Firefox is the browser most people think of first when they want an alternative to Chrome, and for good reason: it’s free, it’s built on Mozilla’s own engine instead of borrowed Chromium code, and it’s been making privacy-by-default claims since long before that was a marketing trend. This review sticks to what Mozilla and Apple’s own pages actually say, dated as of September 2026, rather than reputation or nostalgia. You’ll get the current version, the system requirements, what happens when a session goes wrong, and honestly, where a plain browser install still leaves your tabs exposed. If you’ve ever lost a window of research tabs to a crash you didn’t see coming, the tab-recovery sections matter more than the feature list. Let’s get into what the Firefox browser offers in 2026, and where BelayTab picks up the slack.

What Is the Firefox Browser?

Firefox is a free, open-source web browser made by Mozilla, built on Mozilla’s own Gecko rendering engine rather than the Chromium code that powers Chrome, Edge, Brave, Opera and several others. That single fact is why people bring up Firefox in almost every “alternative browser” conversation. It’s one of the few mainstream options with a genuinely different foundation under the hood.

Here’s the quick reference version before we go section by section.

The web browser Firefox brand covers desktop and mobile builds under one name, plus the ESR (Extended Support Release) track Mozilla maintains for machines that can no longer run the current build. If you’re comparing it against Chromium-based options, our Chrome v Firefox piece and the full browser comparison hub go deeper on specific trade-offs than this review will.

What this review does and doesn’t cover. Every claim here comes from Mozilla’s own pages or StatCounter’s public data, dated as of September 2026. Where an official source didn’t confirm a detail (like an exact “Enhanced Tracking Protection” feature name) this review leaves it out rather than guessing.

What’s New in Firefox in 2026?

The most concrete 2026 fact is the version number itself: Firefox 156.0.1, confirmed directly on Mozilla’s own system requirements page. Mozilla ships Firefox on a rapid release cycle, so by the time you read this the point release may have ticked up again, but the underlying platform and feature set described here should still hold.

Beyond the version bump, Firefox’s own homepage highlights two things worth knowing about if you haven’t opened the browser in a while. First, it now leads with “Choose your AI tools,” letting you access multiple AI chatbots from one place instead of locking you into a single built-in assistant the way some competitors do. Second, PDF editing is named as a built-in capability on the main product page, separate from the browser’s long-standing PDF viewer.

Firefox’s own iOS product page (which applies to the mobile app rather than the desktop browser this review focuses on) lists four headline items: faster page loads, tracking protection without extra setup, instant page summaries in select markets, and sync of tabs, bookmarks and passwords across devices. None of that page’s wording uses the word “iPad” specifically, so treat “Firefox for iPad” as the well-established but not verbatim-confirmed claim it is.

Don’t chase every point release. Point releases (156.0.1, 156.0.2, and so on) are mostly bug and security fixes. Unless you’re troubleshooting a specific crash, there’s rarely a reason to force-update the moment a new number appears — Firefox’s own auto-update mechanism handles this quietly in the background.

Is Firefox Free and What Platforms Does It Run On?

Yes, Firefox is completely free, with no paid tier for the browser itself. Mozilla’s own homepage states this plainly, and the download and install process doesn’t ask for payment or an account at any point.

Platform coverage is broad: Windows, macOS, Linux, Android and iOS are all listed directly on Mozilla’s features page. That’s a wider spread than some Chromium-based rivals publish in one place, and it’s part of why Firefox still shows up as the default recommendation for Linux users in particular.

System requirements are unusually light, which matters if you’re running an older laptop or a low-spec machine:

That macOS figure (512MB RAM) is genuinely low next to what most modern browsers expect, and it’s one reason Firefox turns up on lists of browsers for older or lower-RAM machines. If you’re on hardware too old even for the current release, Firefox ESR 115 exists specifically to keep supporting Windows 8.1 and below, or macOS 10.14 and below, on a slower update cadence.

How Good Is Firefox’s Privacy and Security?

Firefox’s privacy stance is built into the product rather than bolted on: it blocks trackers automatically, applies what Mozilla calls total cookie protection so cookies can’t follow you across sites, and states flatly on its own homepage, “We don’t sell your personal data and we never will.”

That’s a stronger public commitment than most competitors make in their own marketing copy. Mozilla pairs it with a transparency line (“We’re upfront about what data we collect, what we don’t, and how we use it”) which at least gives you somewhere to check the specifics rather than taking the tagline at face value.

A privacy detail worth knowing if you share a computer: Session Restore, the feature that brings your tabs back after closing Firefox, can also keep you logged in to sites from before you closed the browser. That’s convenient on a personal machine and a real consideration on a shared or public one. Private Browsing windows sidestep this entirely. They are never restored and are permanently deleted the moment you close them, by design, not by accident.

What Tab and Organization Features Does Firefox Have?

Firefox organizes tabs with a built-in Tab Groups feature, described on Mozilla’s own features page as letting you “organize your open tabs by project, mood, or task.” That’s a genuinely useful way to keep a research project separate from your open shopping tabs without juggling multiple windows.

Beyond grouping, Firefox’s standard tab toolkit includes History (searchable, with Recently Closed Tabs and Recently Closed Windows sections), Session Restore for bringing an entire browsing session back, and the keyboard shortcuts covered in the next section. If you use tab groups heavily, our dedicated Firefox tabs guide walks through the settings in more depth than fits here.

What Firefox doesn’t advertise on its own current features page, as of this session’s check, are vertical tabs or a sleeping/suspended-tabs mode — features some Chromium browsers do publish. That doesn’t mean Firefox handles many open tabs poorly, just that those two specific mechanisms aren’t confirmed as built-in Firefox capabilities right now, so this review won’t claim them.

• History and Recently Closed. Menu button > History gives you both Recently Closed Tabs and Recently Closed Windows, plus full searchable browsing history.
• Tab Groups. Organize tabs by project or task directly in the tab bar, per Mozilla’s own features page.
• Session Restore. One setting brings back every tab and window from your last session, on every launch if you turn on auto-restore.

How Do I Download and Install the Firefox Browser?

You download Firefox directly from Mozilla’s own site, and installation takes only a few minutes on any supported platform. There’s no license key, no account requirement, and no payment step for the standard desktop or mobile build.

If you’re moving from another browser and want your open tabs to come along rather than starting from a blank slate, that’s a separate job from installing Firefox itself — see the section below on restoring tabs and BelayTab’s own import tools for moving sessions between browsers.

How Do I Restore My Tabs After Closing Firefox or a Crash?

Open the menu button, go to History, and click Restore Previous Session. That’s the manual path, and it works as long as you haven’t already turned on auto-restore, in which case Firefox does this for you at every launch. This is Firefox’s core tab-safety feature, and it’s genuinely good, but it has real edges worth knowing before you rely on it completely.

To turn on auto-restore: open Settings, go to General, scroll to Startup, and check “Open previous windows and tabs.” Once that’s on, every launch (including one after a crash) brings your tabs back automatically, and the manual History menu item disappears since it’s no longer needed.

For quick single-tab or single-window recovery without opening a menu at all, Firefox has dedicated shortcuts. Reopen the last closed tab with Ctrl + Shift + T (Cmd + Shift + T on Mac), and reopen the last closed window with Ctrl + Shift + N (Cmd + Shift + N on Mac). Both require history to be enabled in Settings under Privacy & Security. Our full Firefox restore last session guide covers every path in more detail, including the crash-recovery page and manual session-file recovery, than this review has room for.

If Session Restore ever comes up empty (say, after a hard crash where the session file itself got corrupted) Mozilla keeps rolling backups you can recover from by hand. The main session file, sessionstore.jsonlz4, only gets written when Firefox closes cleanly; while running, Firefox maintains backups in a sessionstore-backups subfolder, including recovery.jsonlz4 (the latest live copy) and previous.jsonlz4 (a clean copy from the last successfully loaded session). You find your profile folder through about:support or about:profiles, then copy one of those backup files into the main profile folder and rename it sessionstore.jsonlz4.

That process works, but it’s fiddly, it requires you to already know something went wrong, and it only recovers whatever Firefox itself last wrote to disk. It’s a reasonable emergency fallback, not something you’d want to rely on as your main tab-safety plan.

Why Does Firefox Keep Crashing, and How Do I Fix It?

Firefox crashes are usually caused by an extension, a theme, hardware acceleration conflicts, or a corrupted profile, and Mozilla’s own troubleshooting order works through those in roughly that sequence. Update Firefox first, since a surprising share of crash reports turn out to be already-fixed bugs in an older build.

If updating doesn’t help, Troubleshoot Mode is the next step. Open the menu, go to Help, and choose Troubleshoot Mode (or hold Shift while launching Firefox). This disables all extensions, switches to the default theme, and turns off hardware acceleration, all at once, so you can tell quickly whether the problem lives in one of those three places. If the crash stops happening in Troubleshoot Mode, one of those is the cause; if it doesn’t, you can rule all three out.

From there, Mozilla’s documented path continues: disable extensions and themes individually to isolate the culprit, try refreshing Firefox (which resets settings but keeps bookmarks, history, open tabs, passwords and cookies while removing extensions and custom preferences), create a new profile if refresh doesn’t help, check for malware, and update graphics drivers. A refresh saves your old profile to a desktop folder named “Old Firefox Data” in case you need to recover something from it afterward.

If Firefox is crashing specifically at startup, before you can even reach these menus, Mozilla maintains a dedicated article for that exact scenario with start-up-specific fixes, and about:support can still gather diagnostics even when the browser is unstable. Our Firefox keeps crashing guide walks through each of these steps in order with more screenshots-level detail. For a crash-report reference number to include when asking Mozilla’s support forum for help, type about:crashes in the address bar — submitted reports start with “bp-” and include your OS, Firefox version, and crash time.

How Does Firefox Compare to Chrome, Edge, and Safari?

Firefox is the only major browser on this list built on a non-Chromium engine, which shapes both its independence and its market position. Chrome, Edge, Brave, Opera, Vivaldi, Arc and Dia all share the Chromium/Blink foundation; Firefox runs Gecko, and Safari runs Apple’s own WebKit.

That independence hasn’t translated into market share. Per StatCounter’s Global Stats for August 2026, the most recent full month available, Chrome leads overall at 69.39%, followed by Safari at 15.83%, Edge at 5.36%, and Firefox at 2.98%. On desktop specifically, the order shifts a bit: Chrome still leads at 73.28%, Edge climbs to 10.46%, Firefox edges ahead of Safari at 5.31% to 5.24%.

Share numbers don’t tell you which browser fits your workflow, though. Chrome’s advantage is mostly the extension ecosystem and near-universal site compatibility testing. Edge leans on Windows integration and Copilot AI features. Safari trades cross-platform reach for tight Apple-device integration and battery efficiency. Firefox’s case is independence from the Chromium ecosystem, a strong default privacy stance, and genuinely light system requirements. If you want a side-by-side on the two most commonly cross-shopped options, Chrome v Firefox and the general browser comparison page both go further than a market-share table can.

Does Firefox Sync Across Devices?

Yes, through Firefox Sync tied to a Firefox Account, though Mozilla’s own features page didn’t itemize the complete list of synced item types in the source checked for this review. What is confirmed is that Firefox shows a Sync view directly in its features page, and the iOS product page separately confirms sync covers tabs, bookmarks and passwords for the mobile app.

Sync is opt-in — nothing about installing or using Firefox requires an account, and you can browse indefinitely without ever signing in. That matters if you’re privacy-conscious about even Mozilla holding a copy of your browsing data, even though Mozilla’s own homepage states it doesn’t sell that data.

If you use Firefox on more than one computer and want your open tabs specifically (not just bookmarks and passwords) to follow you, our dedicated Firefox Sync guide covers setup step by step. Worth noting for anyone comparing sync options across browsers: Firefox Sync moves data between devices you’re signed in on, but it isn’t a version-history or point-in-time-recovery tool. It syncs your current state; it doesn’t keep a searchable history of past sessions the way a dedicated tab manager does.

Sync and backup are different jobs. Sync answers “how do I get my tabs on my other computer.” Backup answers “how do I get an old version of my tabs back after I’ve already changed or lost them.” Firefox Sync solves the first problem well; it isn’t built to solve the second.

How Does BelayTab Protect Your Tabs in Firefox?

BelayTab runs as a browser extension on Firefox and saves your open tabs as named, restorable sessions — automatically and on demand. It’s a different layer than Session Restore: instead of relying on one file that’s only written correctly on a clean close, BelayTab snapshots every open window every 5 minutes and again whenever a window closes, so it’s already capturing your tabs before anything goes wrong.

Every save keeps track of order, pinned tabs, and tab group names and colors, so a session comes back looking the way you left it rather than as a jumbled pile of tabs. Saving is one click or Ctrl + Shift + S (Cmd + Shift + S on Mac), and you can save a whole window, selected tabs, a single tab, or every open window at once. Restoring goes into a new window, the current one, or as single tabs, with large sessions opening in batches of 20 so Firefox doesn’t choke trying to load eighty tabs simultaneously.

The part that matters most after a crash is version history: BelayTab keeps the last 20 versions of every session, and restoring never overwrites. It just adds another version. Pair that with a 30-day trash for deleted sessions and one Recovery screen that pulls together snapshots, deleted sessions, Firefox’s own recently closed windows, and any export files, and you’ve got somewhere to look even when Firefox’s own sessionstore-backups folder comes up empty. Learn more on the automatic snapshots and recovery screen help pages.

It’s worth being direct about limits, too: BelayTab can’t recover tabs from before you installed it, can’t fix a Firefox crash or freeze on its own, and doesn’t suspend or discard tabs to save memory. That’s a different job entirely. What it does is make sure the tabs you had survive whatever happens next, whether that’s a crash, a wrong-click close, or just wanting to go back to a session from three days ago. BelayTab is free, works with no account and no session limits, and if you also use other browsers, it runs on Chrome, Edge, Brave, Opera, Vivaldi, Arc and Safari on Mac too — not on iPhone, iPad or Android. You can download BelayTab directly and start saving your first Firefox session in under a minute.