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Open Source Firefox Alternatives

The best open source alternative to Mozilla Firefox is Brave. If that doesn't suit you, our users have ranked more than 100 alternatives to Mozilla Firefox and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Mozilla Firefox are Pale Moon, Waterfox, Chromium and Tor Browser.

Mozilla Firefox alternatives are mainly Web Browsers but may also be Ad Blockers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Mozilla Firefox.
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  • Gecko

Firefox is a cross-platform web browser developed by the Mozilla Foundation. Firefox is a popular product, used in over 50...

Learn more about Mozilla Firefox

  1. Brave icon

    Brave

    • Mac
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    • iPhone
    • Android Tablet
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    • Homebrew
    • Chocolatey
    • Flathub
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    219 alternatives to Brave 

    Brave Web Browser is a fast, free, secure web browser with a built-in ad blocker*, tracking and security protection, and optimized data and battery experience.

     Suggest and vote on features
    Features
    1.  Privacy focusedBrave is considered a privacy friendly alternative.
    2.  Block TrackersBrave has a feature to block trackers from tracking you.
    3.  No TrackingBrave will not track you or use your personal data.
    4.  Built-in VPNBrave has a built-in VPN feature that enhances your privacy and allows you to browse the web from anywhere.
    5.  Extensible by Plugins/ExtensionsBrave can be extended with add-ons, plugins and extensions.
    6.  Dark ModeBrave supports dark mode for comfortable usage in low light conditions.
    7.  Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
    8.  PortableBrave can be used from a USB stick or similar with no prior installation.
    9.  Picture in PictureBrave allows you to put a video, web page or app in a floating window (always on top of other windows).
    Start Page
    Brave Shield
    Settings
    Brave vs Mozilla Firefox opinions
    Most users think Brave is a great alternative to Mozilla Firefox.
     all • positive • negative      relevance • date
    Kedman

    The best of the best : no ads, very fast, very safe and very free and work with chrome extension

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    Ola

    It's great with a browser that is trying to solve the issue with ads on the web AND the issue that publishers needs money to build cool sites.

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    3
    Guest

    Their privacy claims go as far as Facebook saying "we don't sell your data". You are tracked by cryptocurrency companies (Uphold & Brave rewards), they can ask for ID card as well. In the end this is just Chromium with a build-in ponzi scheme; slower and less private too.

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    tier50obby

    Despite it being marketed otherwise, Brave DOES track you, and the browser is far too crypto-based for it to be a legitimate alternative for most people. (Did I also mention that there are ads everywhere? First-party ads, not third-party ads, but still.)

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    Breaker

    It's not a Mozilla fork and there's ads... Oh the ads.

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    -5
    linoslav

    We don't sell your data... Easily.

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    -1
    enricoce

    it's faster, more secure, sync what you want through different platforms, safe.

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  2. Pale Moon icon

    Pale Moon

    • Windows
    • Linux
    • WinPenPack
    196 alternatives to Pale Moon 

    Pale Moon is an Open Source, Goanna-based web browser available for Microsoft Windows and Linux (with other operating systems in development), focusing on efficiency and customization. Make sure to get the most out of your browser!.

     Suggest and vote on features
    Features
    1.  LightweightPale Moon consumes less device resources compared to similar apps.
    2.  Privacy focusedPale Moon is considered a privacy friendly alternative.
    3.  PortablePale Moon can be used from a USB stick or similar with no prior installation.
    4.  Extensible by Plugins/ExtensionsPale Moon can be extended with add-ons, plugins and extensions.
    Screenshot
    Screenshot
    Screenshot
    Pale Moon vs Mozilla Firefox opinions
    Almost everyone thinks Pale Moon is a great alternative to Mozilla Firefox.
     all • positive • negative      relevance • date
    pefado7045

    Best Good Old Firefox! Pale Moon is the what Firefox should be!

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    2
    sanjeetk4

    It is really light and fast.

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    2
    mcgiwer

    Cons:

    • as base is used a very old version of Firefox
    • bad user experience (interface)
    • an very old (and probably already unsupported) version of Sync
    • no support for modern plugins, extensions and themes
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    -3
    CocoTheLoco

    Pros: Very light. Also very secure. Decent community support, plus old firefox extensions. Open source. Cons: Old version of firefox as base. (solves this: mypal, new experimental version) Bad UI. (solves this: mypal, experimental) no support for modern extensions, themes, plugins, etc (solves this: mypal, again) not available on XP and Vista even though it's light enough for that. (solves this: god damn it mypal again) my rating: 7/10, i would use it as a secondary browser

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    TerriToniAX

    Poor support for plugins, making it useless as you cannot block out distracting ads.

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    jakeBeefiller

    Privacy and security focus.

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    Guest

    Pale Moon is fast, secure and open source. It's compatible with old Firefox's extensions and is private. Lightweight and private. The best alternative

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  3. Waterfox icon

    Waterfox

    • Mac
    • Windows
    • Linux
    • PortableApps.com
    137 alternatives to Waterfox 

    Waterfox is a high performance browser based on the Mozilla platform. Made specifically for 64-Bit systems, Waterfox has one thing in mind: speed.

     Suggest and vote on features
    Features
    1.  Privacy focusedWaterfox is considered a privacy friendly alternative.
    2.  Extensible by Plugins/ExtensionsWaterfox can be extended with add-ons, plugins and extensions.
    3.  PortableWaterfox can be used from a USB stick or similar with no prior installation.
    4.  Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
    Regular Window
    Private Window
    Customize Waterfox
    Waterfox vs Mozilla Firefox opinions
    Almost everyone thinks Waterfox is a great alternative to Mozilla Firefox.
     all • positive • negative      relevance • date
    retroplayeryt

    It's like the Chromium, but for Firefox.

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    0
    Akino

    Waterfox is made for x64 (amd64) CPUs, and it also delivers you a fine service concerning privacy, firstly devs removed telemetry and tracking implented recently in Firefox. Secondly it supports old extensions and pocket was removed

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    Guest

    Dated when compared to actual Firefox, some extensions doesn't work properly due to it being based on a old version of Firefox.

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    5
    Guest

    Waterfox helps keep my private data private (though just the act of trying to keep private makes me somewhat trackable).

    There's also a "Waterfox Classic" branch for people that really miss the OLD firefox. You can use them both independently of each other, or you can have them sync up so that you only need to switch to the new Waterfox when classic won't work.

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    MemeMaster

    Up until late 2020 I was using Pale Moon as my Firefox alternative of choice, but the fact that none of the Firefox addons are compatible with PaleMoon any longer (even the LEGACY addons that USED to be compatible no longer are) I've since switched to Waterfox and haven't looked back at Pale Moon since. What's the point of being a FireFox fork if none of the extensions (including legacy) that used to be compatible no longer are?

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    2
    Schnatt_App

    clean striped open-source alternative if you seek a browser without any telemetry features

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    6
    Guest

    Please keep it updated quicker vs Firefox. That is my only complaint.

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  4. Chromium icon

    Chromium

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    • PC-BSD
    • Xfce
    • Blink Rendering Engine
    181 alternatives to Chromium 

    Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all users to experience the web.

     Suggest and vote on features
    Features
    1.  Extensible by Plugins/ExtensionsChromium can be extended with add-ons, plugins and extensions.
    2.  PortableChromium can be used from a USB stick or similar with no prior installation.
    Start Page
    Settings
    Addons Shop
    Chromium vs Mozilla Firefox opinions
    Almost everyone thinks Chromium is a great alternative to Mozilla Firefox.
     all • positive • negative      relevance • date
    ab1

    Chromium is ahead of others at the moment.

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    -1
    JohnFastman

    Chromium is the core of the Chrome browser. It functions well enough as a browser but lacks some of Chrome's features (e.g. built in language translator). Even though Chromium is open source, it still "phones home" to Google, which has privacy implications. There are more private Chromium-based browsers, such as Brave and Iridium.

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    TerriToniAX

    Not even remotely similar to Firefox. For starters, in Chromium-based browsers there is no real address bar, but instead a combined address bar/search box, which causes every uri you type in here to leak to search engine providers. Secondly, it takes a plugin to disable tabbed browsing, instead of simply unchecking the box "open new pages in a tab instead of a window" as you can do in Firefox.

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    0
    Curuxa

    Not similar IU, less security and privacy, no DRM, hard to install if you use Windows and you must use instead a random version of this like I googled chromium. Also it doesn't have the same support of Firefox, nor custom support, nor a good webstore ...

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    Guest

    Different from Firefox, it doesn't autoupdate on Windows. You need to basically download a new browser per wiki and install... On Linux, it's more easy to manage updates depending on the distros, on Arch Linux/Debian it's so easy, but hard on Ubuntu/Mint.

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    Guest

    By default, it doesn't support DRM because the missing Widevine plugin/codec

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    Guest

    Chromium doesn't have DRM features and some codecs implemented like Google Chrome, it's open-source but all your data goes to Google when you use Chrome Store to download apps since there is no Chromium store. Also, this browser is hard to install on Windows, you have to compile or download versions that are created by the users daily, so it means you do not have a proper installer like on Linux/BSD.

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  5. Tor Browser icon

    Tor Browser

    • Mac
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    • Linux
    • Android
    • Android Tablet
    • OpenBSD
    229 alternatives to Tor Browser 

    The Tor software protects you by bouncing your communications around a distributed network of relays run by volunteers all around the world: it prevents somebody watching your Internet connection from learning what sites you visit, it prevents the sites you visit from learning...

     Suggest and vote on features
    Features
    1.  Privacy focusedTor Browser is considered a privacy friendly alternative.
    2.  Built-in VPNTor Browser has a built-in VPN feature that enhances your privacy and allows you to browse the web from anywhere.
    3.  Block TrackersTor Browser has a feature to block trackers from tracking you.
    4.  PortableTor Browser can be used from a USB stick or similar with no prior installation.
    Screenshot
    Tor Browser 10.0.3 is now based on the new version of Firefox for Android.
    Tor browser for android alpha
    Tor Browser vs Mozilla Firefox opinions
    pros, cons and recent comments
    Guest

    Customized Firefox for anonymity (blends in with other tor user making it hard to fingerprint/identify)

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  6. Firefox Developer Edition icon

    Firefox Developer Edition

    • Mac
    • Windows
    • Linux
    • PortableApps.com
    196 alternatives to Firefox Developer Edition 

    Firefox Developer Edition brings you latest features, fast performance, and the development tools you need to build for the open web. Its powerful development tools will extend your ability to work across multiple platforms from one place.

     Suggest and vote on features
    Features
    1.  PortableFirefox Developer Edition can be used from a USB stick or similar with no prior installation.
    2.  Privacy focusedFirefox Developer Edition is considered a privacy friendly alternative.
    3.  Block TrackersFirefox Developer Edition has a feature to block trackers from tracking you.
    Screenshot
    Shapes Editor
    Master CSS Grid
    Firefox Developer Edition vs Mozilla Firefox opinions
    Almost everyone thinks Firefox Developer Edition is a great alternative to Mozilla Firefox.
    axy_david

    If you have issues with Firefox not being fast enough but don't wanna go Chrome try this! Also faster than Chrome.

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    8
    sarpertoksoz

    offical edition of firefox

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    0
  7. Falkon icon

    Falkon

    • Windows
    • Linux
    • Haiku
    189 alternatives to Falkon 

    Falkon, formerly QupZilla, is a QtWebEngine based cross-platform web browser.

    It aims to be a lightweight web browser available through all major platforms.

    Falkon has all standard functions you expect from a web browser. It includes bookmarks, history (both also in sidebar).

     Suggest and vote on features
    Features
    1.  LightweightFalkon consumes less device resources compared to similar apps.
    2.  PortableFalkon can be used from a USB stick or similar with no prior installation.
    3.  Extensible by Plugins/ExtensionsFalkon can be extended with add-ons, plugins and extensions.
    Screenshot
    Screenshot
    Falkon vs Mozilla Firefox opinions
    Most users think Falkon is a great alternative to Mozilla Firefox.
    Curuxa

    It isn't really bad, but not a lot of add-ons and based con Qtweb (chromium). Not fingerprinting protection like Firefox but also no telemetry by default. It is ok, but it could be better.

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    Guest

    Brings aut of the box what you need and don't support datastealing apps

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    -2
  8. LibreWolf icon

    LibreWolf

    • Mac
    • Windows
    • Linux
    • Linux Mint
    • Arch Linux
    • Gentoo Linux
    • Fedora
    • Ubuntu
    • Debian
    • OpenBSD
    64 alternatives to LibreWolf 

    This project is an independent fork of Firefox, with the primary goals of privacy security and user freedom. It is the community run successor to LibreFox

     Suggest and vote on features
    Features
    1.  Privacy focusedLibreWolf is considered a privacy friendly alternative.
    2.  No TrackingLibreWolf will not track you or use your personal data.
    3.  Block TrackersLibreWolf has a feature to block trackers from tracking you.
    4.  PortableLibreWolf can be used from a USB stick or similar with no prior installation.
    5.  Extensible by Plugins/ExtensionsLibreWolf can be extended with add-ons, plugins and extensions.
    6.  Ad-freeLibreWolf doesn't contain any form of external advertising.
    Screenshot
    Screenshot
    LibreWolf vs Mozilla Firefox opinions
    pros, cons and recent comments
    RemovedUser

    don't confuse this with librefox (that was last updated back in 2018), this is a new build that has portable variation (provided launcher that you can register as a browser in Windows). releases sits at https://gitlab.com/librewolf-community/browser/windows/-/releases (other OS available)

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    2
    hasanyildiz

    It is suitable for everyone's use. Download and try.

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    1
    ionmarmalade

    This thing is a joke... A tragic fork of Firefox that restricts choices and breaks so many functions which are not recoverable with modification no matter how much you dig into the backend. Not to mention so many red flags as to how they themselves are using the program to syphon data on its users. Don't use it, unless you want them to sell your data.

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    2
    Reborn

    The best alternative to Firefox. Unlike other forks, LibreWolf is compiled from the newest version available. Privacy out-of-the-box, no Pocket, no telemetry, uBlock Origin installed with the browser.

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    PoorPocketsMcNewHold

    A fork of Firefox, with a pretty good out-of-the-box Privacy configuration.

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    2
  9. SeaMonkey icon

    SeaMonkey

    • Mac
    • Windows
    • Linux
    • BSD
    • PortableApps.com
    240 alternatives to SeaMonkey 

    Web-browser, advanced e-mail, newsgroup and feed client, IRC chat, and HTML editing in one application. Itis built on the open source Mozilla Gecko engine, the same code which underlies Thunderbird and is the base for the Firefox browser.

     Suggest and vote on features
    Features
    1.  WYSIWYG SupportSeaMonkey integrates a WYSIWYG editor to edit the look and content of a document, page, or file.
    2.  LightweightSeaMonkey consumes less device resources compared to similar apps.
    3.  Privacy focusedSeaMonkey is considered a privacy friendly alternative.
    4.  PortableSeaMonkey can be used from a USB stick or similar with no prior installation.
    5.  Extensible by Plugins/ExtensionsSeaMonkey can be extended with add-ons, plugins and extensions.
    Linux version browser
    MacOS version browser
    W10 version browser
    SeaMonkey vs Mozilla Firefox opinions
    Most users think SeaMonkey is a great alternative to Mozilla Firefox.
    Curuxa

    It has Spyware (telemetry) but you can disable it like Firefox, so it isn't bad.

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    Guest

    Less resource-intensive than Firefox. Generally fast and stable.

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    3
    Guest

    I likee SeaMonkey because is lightweight, have add-on support, support old versions of Windows, and as a old-school design that combines with the system i use. Perfect alternative, i recommend giving a try!

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    Guest

    It's the Father of Firefox and has an EXCELLENT team to keep it up to date and with current Firefox code. I just love this browser. ;)

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    3
    kompowiec2

    Lighweight and is without soros Support.

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    -3
    mzs_47

    Lighter on resources, had UI we were used to in old Firefox(version 3.x), some features like webRTC might be missing.

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    2
    Guest

    Within Linux works much more fast and compatible with Firefox extensions

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    2
  10. Ungoogled Chromium icon

    Ungoogled Chromium

    • Mac
    • Windows
    • Linux
    203 alternatives to Ungoogled Chromium 

    A Google Chromium variant for removing Google integration and enhancing privacy, control, and transparency

     Suggest and vote on features
    Features
    1.  Privacy focusedUngoogled Chromium is considered a privacy friendly alternative.
    2.  Extensible by Plugins/ExtensionsUngoogled Chromium can be extended with add-ons, plugins and extensions.
    3.  PortableUngoogled Chromium can be used from a USB stick or similar with no prior installation.
    Screenshot
    Ungoogled Chromium vs Mozilla Firefox opinions
    Almost everyone thinks Ungoogled Chromium is a great alternative to Mozilla Firefox.
    JohnFastman

    Despite Chromium being "open source", it still downloads Google-related crap and phones home to Google. If you value your online privacy, you'll appreciate the Ungoogled Chromium browser, which removes all that. However, Firefox remains more customizable in terms of privacy options.

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    21
    Guest

    Google services do not work properly on this browser, no DRM support of proprietary codecs available. Also, on Windows there is no .exe to click and install you need to compile and build it, it's not that simple and pretty limited in customization, even more than proper Google Chrome.

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    -17
    Guest
    1. It doesn't update like Chromium 2. It's hard to install on Windows and Linux 3. There is no DRM support, so forget about watching Netflix on it 4. It's hard to install extensions, no access to Google Web Store. 5. No Widevine codec available and to install it is hard and need manual intervention that doesn't work always.
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    -5
Showing 10 of 108 alternatives
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