Waterfox Browser Review 2026: Privacy, Tabs, and Tradeoffs

The Waterfox browser keeps showing up in the same conversation as Firefox forks that promise more privacy and less corporate baggage. If you’re wondering whether it’s worth installing, or whether it’s just Firefox with different defaults, this review sticks to what Waterfox’s own site and release notes actually say as of September 2026 — no ratings, no guesses.

You’ll get the plain facts here: who builds it, what it costs, how it handles ads and tracking, which devices it runs on, and where its Tree tabs genuinely help. Waterfox runs on the same Gecko engine as Firefox, which is why most Firefox extensions install without drama, but it isn’t a drop-in replacement everywhere. There’s no iOS build, and its own documentation doesn’t spell out a sync feature the way Firefox does.

We’ll also cover the part that matters if you keep dozens of tabs open at once: how to protect that window before you experiment with a new browser, and which supported browsers to move to if Waterfox doesn’t end up being the long-term home for your tabs.

What Is the Waterfox Browser?

Waterfox is a free, open-source web browser built on Mozilla’s Gecko engine (the same rendering engine Firefox uses) and developed by BrowserWorks Ltd. It’s a separate project from Mozilla, not an official Firefox edition, and it markets itself around privacy defaults that are switched on out of the box rather than left for you to configure.

The pitch is straightforward: get a browser that looks and mostly behaves like Firefox, but with ad and tracker blocking, no telemetry, and a couple of privacy-oriented network features already turned on. It’s aimed at people who like Firefox’s engine and extension ecosystem but want fewer settings to hunt down after a fresh install.

Here’s the short version for anyone comparing it against other options before committing to a download.

If none of those rows match your situation, the sections below go deeper on each point, including how Waterfox makes money if it isn’t charging you for the browser.

Is Waterfox Based on Firefox?

Yes — Waterfox runs on Gecko, described on its own homepage as “the same Gecko engine as Firefox,” and that shared foundation is the single most important fact about the browser. Gecko is the rendering engine that decides how web pages get drawn, how JavaScript runs, and which web standards work, so two browsers sharing it will render sites almost identically.

Practically, this means Waterfox isn’t reinventing how pages load or how extensions hook into the browser. Waterfox’s own site states that “most sites and extensions work as expected” as a direct result of that shared engine. If a site renders fine in Firefox, it’s reasonable to expect it to render the same way in Waterfox, since the underlying engine handling the HTML, CSS, and JavaScript hasn’t changed.

That said, sharing an engine isn’t the same as sharing a company. Waterfox is independently developed, and BrowserWorks Ltd (not Mozilla) decides what ships, when, and with which defaults on. If you’re coming from Firefox and want a sense of what you’d be leaving behind feature-for-feature, our Firefox browser review covers the Mozilla side of that comparison, and the Firefox hub page has more on the browser Waterfox is built from.

Waterfox vs Firefox: What’s Actually Different?

The core difference is defaults and business model, not the rendering engine underneath. Both browsers use Gecko, but Waterfox turns on privacy features by default that Firefox leaves as optional settings or separate downloads, and the two are run by entirely different organizations.

Here’s a side-by-side of the documented differences.

That last row matters if you’re a heavy tab user. Firefox’s sync story is well established and covered in our Firefox Sync guide; Waterfox’s own pages don’t spell out an equivalent, which is a real gap worth knowing about before you switch your main browser over.

Who Makes Waterfox, and Is It Actively Maintained?

BrowserWorks Ltd, a UK-registered company, currently develops and operates Waterfox. The browser was originally founded by Alex Kontos in 2011, and Kontos still directs BrowserWorks today, giving the project continuity from its earliest days rather than a change of hands mid-stream.

Active maintenance is easy to verify by release cadence: Waterfox 6.7.4 shipped on 22 September 2026, per the project’s own release notes, which is a recent, dated release rather than an old build sitting untouched. Regular version bumps with named release notes are one of the clearer signals that a browser project is still funded and staffed, as opposed to an open-source repository that’s technically “available” but hasn’t been touched in years.

There’s also a concrete example of BrowserWorks investing beyond its own codebase. The company is sponsoring the developer of the Tree Style Tab extension (a popular Firefox add-on for hierarchical tabs) to build a native, virtual-scrolling tab-tree sidebar directly into Waterfox, without needing a third-party extension. Waterfox’s own post about the sponsorship notes that the resulting performance work benefits all Tree Style Tab users, regardless of which browser they use, not just Waterfox’s audience.

If you’re evaluating whether a smaller, independent browser is a safe long-term bet, this kind of visible investment in the wider ecosystem is a better signal than marketing copy. It shows the team is putting resources into infrastructure other people rely on, not just its own install numbers.

Is Waterfox Free, and How Does It Make Money?

Waterfox is free and open source, with no premium tier or payment required to download or use the browser itself. That’s stated directly on Waterfox’s own homepage, and it applies to every platform the browser ships on.

Since there’s no subscription gate on the core product, the obvious question is how BrowserWorks pays for development. The answer is a search-partnership arrangement (Waterfox’s current partner is Qwant) plus an optional paid add-on called Waterfox Private Search, a subscription some users choose to buy on top of the free browser. Search partnerships are a common revenue model for independent browsers: the default search engine or search-result placement earns the maker a share of revenue, without charging the end user directly.

The important nuance is that this revenue model is separate from the browser license. Waterfox Private Search is opt-in, and choosing not to buy it doesn’t limit any core browsing feature — the ad blocking, telemetry defaults, and DNS privacy settings described in Waterfox’s privacy policy apply regardless of whether you pay for anything.

Old domain, same project. waterfox.net now redirects to waterfox.com, which is the current official domain. If you have an old bookmark pointing at the .net address, it’ll still get you to the right place, but it’s worth updating.

For comparison, most competing browsers on the market either run on advertising-adjacent revenue you don’t see directly, or charge outright for a “pro” tier. If you want a wider view of how paid and free browsers stack up, our best browser roundup for 2026 walks through several models side by side.

What’s New in Waterfox 6.7.4 (September 2026)?

Waterfox 6.7.4, released 22 September 2026, is the current stable version and brings a handful of specific, documented changes rather than a broad rewrite. If you’re already running an older Waterfox build, here’s what changed.

• RSS feeds and Live Bookmarks are back, accessible through an icon in the address bar — a feature some longtime Firefox users will recognize from years ago.
• A new toggle, on by default, hides AI-generated answers on search engines that support it, giving you a way to see plain search results without extra AI summary boxes.
• The bundled JPEG-XL decoder was upgraded from version 0.6.0 to 0.7.4, which affects how that newer image format renders in-browser.
• The “1.org Charitable Search” engine option was discontinued after its underlying System1 partnership ended, so it no longer appears as a search choice.

None of these are dramatic, headline-grabbing changes, and that’s arguably a good sign for a browser built on a shared engine — the bulk of the real engineering work (security patches, web-standards support) happens upstream in Gecko, and BrowserWorks’ own releases layer smaller, deliberate additions on top.

If you’re deciding whether to update immediately, the RSS/Live Bookmarks return is the change most likely to affect daily use if you relied on that feature in an older Firefox version. The AI-answer toggle is worth checking even if you don’t update right away, since it ships on by default and changes what your search results page looks like.

Is Waterfox Safe and Private to Use?

Waterfox is built around several privacy defaults that are switched on without any configuration, according to its own privacy policy. The headline claim is straightforward: “Waterfox has no telemetry. It does not build a profile of you, send us a record of your browsing activity or have an analytics pipeline to send it to.” Telemetry, crash reporting, studies, and experiments are all disabled at build time with locked switches, meaning they aren’t something you have to remember to turn off after installing.

Ad and tracker blocking is also on from first launch. Waterfox ships with bundled filter lists, so (per its own documentation) “it works offline from the first launch” without waiting on a network fetch to start protecting you. Two more specific privacy features round this out: search-suggestion requests are proxied through Waterfox’s own service, where IP addresses are described as dropped immediately and never stored, and DNS lookups use DNS-over-Oblivious-HTTP by default, a structure designed so no single party can see both your identity and what you searched for.

What Waterfox’s privacy policy doesn’t address is anti-fingerprinting — the practice of resisting attempts to identify your specific browser instance through subtle configuration details. That’s a real gap to flag rather than assume either way; treat it as an open question rather than a feature.

Privacy settings protect what leaves your computer over the network. They don’t do anything for the tabs sitting open in your window if the browser crashes, an update misfires, or you close the wrong window by mistake. That’s a separate risk entirely, and one worth planning for regardless of which privacy-focused browser you pick.

Which Devices and Operating Systems Run Waterfox?

Waterfox runs on Windows, macOS, and Linux for desktop, plus a native Android app. There is no official iOS build as of September 2026. Each desktop platform has its own specific installer format and minimum requirement, which matters if you’re on older or less common hardware.

Across every platform, Waterfox requires an SSE4.2-capable CPU, which rules out very old processors regardless of operating system. On Linux specifically, you’ll also need glibc 2.17 or newer, so a very old distribution might need an upgrade before Waterfox will install cleanly.

The Android app is worth calling out separately since it’s tracked on its own release schedule from the desktop builds — don’t assume a desktop version number tells you anything about what’s current on Android. If you’re specifically comparing mobile browser options rather than desktop ones, our guide to the best internet browser for Android covers more of that ground, and you can always check exactly what browser and version you’re running with our what is my browser tool.

How Do You Download and Install Waterfox?

You download Waterfox directly from its own site, at waterfox.com/download, and choose the installer that matches your operating system and processor rather than searching for a mirror. Going straight to the official domain matters more than usual for a smaller, independent browser, since search results for lesser-known software are exactly where fake installers tend to show up.

Once you’re on the download page, picking the right build comes down to two things: your platform, and for Windows and Linux, your specific architecture or package format. Windows offers x64 and ARM64 installers, macOS ships one universal .dmg that covers both Intel and Apple Silicon, and Linux gives you a choice of DEB, RPM, or a generic tarball depending on your distribution.

If you’re moving from Firefox and want your bookmarks and saved logins to come along, do that import during first launch rather than after you’ve already started building a new set inside Waterfox. It’s a cleaner cutover and avoids duplicate entries later. Beyond that first setup, protecting whatever you build inside Waterfox is a separate concern, covered next.

Does Waterfox Support Firefox Extensions and Add-ons?

Broadly, yes — Waterfox’s shared Gecko engine is the reason its homepage claims that “most sites and extensions work as expected,” and its Android download page separately promises “full extension support” once the native app is installed. Extension compatibility is one of the more practical reasons people consider a Firefox fork in the first place: nobody wants to lose their carefully configured extension setup just to get a different set of default privacy settings.

Where the documentation gets less specific is on desktop: no page fetched from Waterfox’s official site names the Mozilla add-on store directly for the desktop build, even though the shared-engine claim strongly implies broad compatibility. If exact add-on store sourcing matters for your workflow (say, you manage extensions for a team) it’s worth testing your specific must-have extensions after installing rather than assuming a one-to-one match with Firefox’s exact extension catalog.

If extension support and a Gecko-based browser are what you’re after, Waterfox isn’t the only option built this way. A few other forks are worth knowing about if Waterfox’s specific mix of features doesn’t fit.

Each of those takes the same Gecko foundation in a different direction — Zen toward workspace organization, Tor toward anonymity, Waterfox toward privacy defaults with less setup. Our Firefox alternative browser roundup and dedicated Zen Browser review go deeper on how those specific projects compare if you’re shopping around rather than set on Waterfox already.

How Do You Protect Your Tabs in Waterfox?

Waterfox gives you Tree tabs for organizing open tabs into a hierarchy, plus a restored classic status bar, but it doesn’t publish a built-in sync or cross-device backup feature — so protecting a large tab session still comes down to habits you build yourself. That’s a real gap for anyone who treats their browser window as a working notebook rather than a handful of quick lookups.

The manual options are the same ones that work in any Gecko-based browser: bookmark all open tabs into a folder before closing anything risky, or export your bookmarks to an HTML file as a snapshot you can restore later. Neither of those captures tab order, pinned status, or groups the way a dedicated session tool does, and neither runs automatically. You have to remember to do it before something goes wrong, not after.

This is also where it’s worth being direct about what BelayTab can and can’t do for you here. BelayTab currently supports Chrome, Edge, Brave, Opera, Vivaldi, Arc, Firefox, and Safari on Mac — Waterfox isn’t on that list, and we won’t pretend otherwise. If protecting your open tabs automatically matters more to you than Waterfox’s specific privacy defaults, the practical move is to do your daily browsing in one of BelayTab’s supported browsers instead, with Firefox being the closest cousin since it also runs on Gecko.

1. Pick a supported browser. Firefox is the most similar to Waterfox since both use Gecko; Chrome, Edge, Brave, Opera, Vivaldi, and Arc are also supported if you’d rather switch families entirely.
2. Install BelayTab from the download page. It’s free, with no account and no limit on sessions or tabs.
3. Save your current window immediately. Click the toolbar icon or press Ctrl + Shift + S (Cmd + Shift + S on Mac) to save it as a named session before you do anything else.
4. Let automatic snapshots take over. BelayTab captures every open window on a five-minute timer and again when a window closes, so you’re covered even if you forget to save manually next time.

Once that’s running, BelayTab’s automatic snapshots and tab restore features mean a crash, an accidental window close, or a bad update doesn’t cost you the research tabs, the half-written email drafts, or the flight booking you had open. That’s a different problem from the one Waterfox’s privacy defaults solve, and it’s one worth covering separately no matter which browser you land on.

Waterfox is a genuinely maintained, privacy-forward browser with real, dated evidence behind its claims — no telemetry, ads and trackers blocked by default, and a company still shipping regular releases. What it doesn’t offer, based on its own documentation, is an iOS build or a documented sync feature, and neither does it currently work with BelayTab. If either of those matters more to your daily routine than Waterfox’s specific privacy defaults, Firefox gets you the same engine with both gaps covered.