Open Source Mozilla Firefox Alternatives

Popular open source Alternatives to Mozilla Firefox for Linux, Windows, Mac, Android, Android Tablet and more. Explore 25+ apps like Mozilla Firefox, all suggested and ranked by the AlternativeTo user community.

Free and open-source web browser If you're looking for more info about Mozilla Firefox like screenshots, reviews and comments you should visit our info page about it. Below you find the best alternatives.

The list of alternatives was last updated: 6/25/2020 11:58:00 AM

Alternatives to Mozilla Firefox for all platforms with Open Source License

  • Pale Moon

    Pale Moon is an Open Source, Goanna-based web browser available for Microsoft Windows and Linux focusing on efficiency and ease of use.

    • When Firefox become more and more bloated Pale Moon is lightweight, offers stability and compatibility with the FF extensions (for now, because WebExtensions). It also works great with a lot of tabs(400 or more). Guest • Mar 2017 • 31 agrees and 12 disagrees Disagree   Agree
    • Old looking UI. It needs to be updated. Guest • Jun 2020 Disagree   Agree
    • It has the most similarity to firefox whitout being firefox nightly, which is just firefox but more updated and usually more unstable. It has a mid 2000's site like feel without feeling outdated. It has tons of features, and has some compatibility features with Gecko/Firefox add-ons, which in my opinion makes it a great alternative to firefox. It does not have a blacklist of sites, unlike firefox. Guest • Jan 2020 • 2 agrees and 2 disagrees Disagree   Agree
    • Fast browser. Simple preferences setup. Clean install with no hidden junk in my registry or secret files like chrome and mozilla-firefox. My backup browser is Waterfox. i run on win7 x64. Guest • Aug 2019 • 4 agrees and 1 disagrees Disagree   Agree
    • less bloatware. not control by big company. Guest • May 2019 • 2 agrees and 4 disagrees Disagree   Agree
    • So far, Pale Moon gives me features I want that Firefox has disabled and will soon be gone completely in Firefox 57. Firefox 57 will be a Chrome-like boat anchor. Pale Moon is very stable, lightweight and is fast Guest • Apr 2017 • 22 agrees and 11 disagrees Disagree   Agree
    • Pale Moon is very lightweight (low RAM usage), and maintains the look and feel of earlier versions of Firefox. Essentially, this is the Firefox Mozilla should have made. Guest • May 2017 • 6 agrees and 2 disagrees Disagree   Agree
    • It is faithful to the core principles of Firefox (customization, extendibility, user friendliness...), avoiding the bloating and the questionable decisions taken in the last years by Mozilla. Pale Moon is the browser for those of us that loved Firefox in its golden years. Guest • Jun 2018 • 1 agrees and 2 disagrees Disagree   Agree
    • Pale Moon resembles old Firefox, and maintains support for old extensions, and old features. Guest • Mar 2018 • 2 agrees and 1 disagrees Disagree   Agree
    • Pale Moon is very good, all sites are loading almost the same as Firefox, but uses less RAM & CPU, so the system is working faster than with Firefox, and also removed unnecessary functions. Pale Moon add-ons are very useful, especially YouTube Downloader and Adblock Latitude. Configurable very, very nice browser, 10 out of 10 points. Guest • May 2018 • 0 agrees and 1 disagrees Disagree   Agree
    • Firefox classic UI and faster than Firefox. It's more user friendly and easier to use. Firefox is too jumbled and complicated. Guest • Apr 2018 • 0 agrees and 2 disagrees Disagree   Agree
    • Firefox is no longer just a good browser. Firefox is going to be a Google Chrome clone. It is dropping support for legacy add-ons. Firefox is dropping support for XP and Vista. Pale Moon has committed to retaining support for add-ons, menu's, security and still remains lightweight. Guest • Apr 2017 • 7 agrees and 4 disagrees Disagree   Agree
    • Much more stable than the actual firefox. 1 crash per day vs. 1 crash per two weeks on MacOSX Guest • Mar 2016 • 15 agrees and 10 disagrees Disagree   Agree
    • It's way faster than Mozilla Firefox Guest • Jun 2017 • 0 agrees and 2 disagrees Disagree   Agree

    Free Open Source Mac Windows Linux

    Pale Moon icon
  • 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. *What is Brave Ad Replacement? Brave’s goal is to speed up the web, stop bad ads and pay publishers. One of the ways we plan to accomplish this is with ad replacements. We will also invite users to fund their wallets and to use those funds to pay the publishers of their favorite websites.

    • Brave is open-source and privacy focused like Firefox. It uses the open Chromium Engine used also by Chrome and so it is really fast. It has built-in Tor and a good Ad-blocker. Brave intrduced a new way to reward content publishers with privacy-minded ads (you can activate/deactivate this feature when you want). Guest • Jun 2019 • 2 agrees and 4 disagrees Disagree   Agree
    • Currently (March 2017), Brave is not a mature project. It's an open-source privacy-oriented browser and very fast. But you rely on the developers to provide most of the privacy settings, and you can't install extensions. Firefox remains much more customizable via it's about:config menu options. JohnFastmanMar 2017 • 15 agrees and 8 disagrees Disagree   Agree
    • Built-in ad-blocker, free and open-source. Guest • Feb 2018 • 2 agrees and 3 disagrees Disagree   Agree
    • Not secure at all, based on Chromium as 99% of the browsers. It doesn't get my respect. No differencial, just Chromium + some extensions implemented. Guest • Nov 2019 • 14 agrees and 6 disagrees Disagree   Agree
    • Feature of different user profiles and earning money from ads - those two I only found at Brave. c4rismooreMay 2020 Disagree   Agree
    • JohnFastman made a review 2 years ago when Brave was using Muon Browser as a source. Brave now officially supports Chromium extensions because it uses Chromium as a source, so feel free to use Brave as a replacement for Google Chrome and Firefox. Guest • May 2019 • 4 agrees and 8 disagrees Disagree   Agree
    • I have been using FireFox for years. Recently I have been inundated ads. I noticed that after a recent FireFox update, none of the plugins were operating. I was unable to install updates to the plugins. I decided the try Brave. Elminated all ads, and I didn't need a plugin. Also it is much faster than my FireFox. Guest • May 2019 • 4 agrees and 8 disagrees Disagree   Agree
    • Its super fast, private and has Tor implemented. Its reliable and ive never had any problems with it, The_Quantum_AlphaMar 2019 Disagree   Agree
    • It's really really nice and fast, but is still in very early development and lacking a lot of features Guest • Apr 2017 • 9 agrees and 4 disagrees Disagree   Agree
    • Read my review. Brave is Firefox baby with more privacy and clear interface AkinoJun 2017 • 2 agrees and 6 disagrees Disagree   Agree

    Free Open Source Mac Windows Linux Android iPhone ... Android Tablet iPad Electron / Atom Shell

    Brave icon
  • 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. What makes Waterfox so fast? It's built with Intel's C++ compiler. One of the most powerful compilers out there. This enables us to make the fastest possible web browser for all the code changes we make. This potent combination makes for an unparalleled browsing experience.

    • clean striped open-source alternative if you seek a browser without any telemetry features Schnatt_AppFeb 2020 • 3 agrees and 1 disagrees Disagree   Agree
    • It depends what you want from a Firefox alternative. Waterfox is essentially identical to Firefox, except that it's a 64-bit, not a 32-bit browser. It's still open source and fully compatible with all options, extensions and everything else. JohnFastmanDec 2016 • 20 agrees and 7 disagrees Disagree   Agree
    • Open source fork of Firefox with a few privacy settings (not not all) changed by default. Guest • May 2018 • 1 agrees and 0 disagrees Disagree   Agree
    • 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 AkinoJun 2017 • 31 agrees and 10 disagrees Disagree   Agree
    • Fast, supports the old extensions. Guest • May 2019 • 10 agrees and 2 disagrees Disagree   Agree
    • Fast. Support for XUL addons. Interface customisation unrestricted x Guest • Aug 2019 • 4 agrees and 2 disagrees Disagree   Agree
    • Please keep it updated quicker vs Firefox. That is my only complaint. Guest • Dec 2019 Disagree   Agree
    • The 64 bit version of this browser is very lightweight. In fact, it can compare with 32 bit version of another browser. khanhlong17112000Oct 2019 Disagree   Agree
    • Dated when compared to actual Firefox, some extensions doesn't work properly due to it being based on a old version of Firefox. Guest • Nov 2019 • 1 agrees and 0 disagrees Disagree   Agree
    • Great 64-bit alternative, it's lighting-fast & ditches the telemetry. Guest • Aug 2017 • 9 agrees and 4 disagrees Disagree   Agree
    • It is completely compatible with every feature present in Firefox, so you don't lose *anything* when migrating, and win privacy, speed and security. Guest • Oct 2017 • 6 agrees and 4 disagrees Disagree   Agree
    • Uses almost all the original code of firefox but keeps the "undesired" NPAPI that firefox dropped, another words user retains ability to change the browser's UI & behaviour Guest • Nov 2017 • 3 agrees and 1 disagrees Disagree   Agree
    • So far this is the BEST replacement I have found for FireFox 57 (which is just a Chrome clone at this point) Guest • Nov 2017 • 2 agrees and 1 disagrees Disagree   Agree
    • Waterfox is so far the closest to modern Firefox, but with better privacy, and a commitment to maintain XUL/XPCOM support indefinitely so that I can keep using a modern theme with square tabs, centred bookmarks and of course the add-on bar. birdNov 2017 • 3 agrees and 1 disagrees Disagree   Agree
    • The option to accept or dent cookies... Guest • Oct 2017 • 1 agrees and 0 disagrees Disagree   Agree

    Free Open Source Mac Windows Linux

    Waterfox icon
  • 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. An unofficial portable version of Chromium is available here: Windows binaries are available at:

    • 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. JohnFastmanDec 2016 • 40 agrees and 15 disagrees Disagree   Agree
    • 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. Guest • Jun 2019 • 12 agrees and 5 disagrees Disagree   Agree
    • 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. Guest • Jul 2020 Disagree   Agree
    • By default, it doesn't support DRM because the missing Widevine plugin/codec Guest • Jun 2020 Disagree   Agree
    • Chromium is most likely the heart of Google Chrome, Opera and some browsers without fancy features. SiliconeValleySep 2016 • 15 agrees and 11 disagrees Disagree   Agree
    • Chromium is not a ready-for-the-consumer software. It is a open source project that needs to be implemented to make it work. jacksarroccoJul 2016 • 27 agrees and 106 disagrees Disagree   Agree

    Free Open Source Mac Windows Linux BSD PC-BSD ... Xfce

    Chromium icon
  • Firefox Nightly

    Firefox Nightly is the development (alpha) release channel of Mozilla Firefox . Firefox Nightly gets a new version every few hours. It offers access to bleeding edge features of the development branch of Firefox before they make a final release.

    • If you want a more updates and If you are tester, you liked her! Guest • May 2020 Disagree   Agree

    Free Open Source Mac Windows Linux Android Chrome OS ... Android Tablet Kindle Fire

    Firefox Nightly icon
  • 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.

    • If you have issues with Firefox not being fast enough but don't wanna go Chrome try this! Also faster than Chrome. axy_davidJan 2018 • 10 agrees and 4 disagrees Disagree   Agree

    Free Open Source Mac Windows Linux

    Firefox Developer Edition icon
  • 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) and tabs. Above that, it has by default enabled blocking ads with a built-in AdBlock plugin. During the Akademy 2017 Konqueror BoF, the ex-maintainer of https://alternativeto .

    • Brings aut of the box what you need and don't support datastealing apps Guest • Nov 2018 • 3 agrees and 5 disagrees Disagree   Agree

    Free Open Source Windows Linux

    Falkon icon
  • SeaMonkey

    The SeaMonkey project is a community effort to develop the SeaMonkey all-in-one internet application suite. A lighter alternative to Mozilla Firefox. Such a software suite was previously made popular by Netscape and Mozilla, and the SeaMonkey project continues to develop and deliver high-quality updates to this concept.

    • 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. ;) Guest • Jan 2019 • 3 agrees and 1 disagrees Disagree   Agree
    • Less resource-intensive than Firefox. Generally fast and stable. Guest • May 2017 • 6 agrees and 4 disagrees Disagree   Agree
    • Lighweight and is without soros Support. kompowiec2Aug 2017 • 3 agrees and 1 disagrees Disagree   Agree
    • Within Linux works much more fast and compatible with Firefox extensions Guest • Jul 2015 • 5 agrees and 3 disagrees Disagree   Agree
    • Lighter on resources, had UI we were used to in old Firefox(version 3.x), some features like webRTC might be missing. mzs_47Sep 2015 • 5 agrees and 3 disagrees Disagree   Agree

    Free Open Source Mac Windows Linux BSD

    SeaMonkey icon
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  • GNU IceCat

    Gnuzilla is the GNU version of the Mozilla suite, and GNU IceCat is the GNU version of the Mozilla Firefox browser. Its main advantage is an ethical one: it is entirely free software. While the principal source code from the Mozilla project is free software, the distribution contains various problematic files, the EULA they require for use of their binaries is troublesome, and they distribute and recommend non-free software as plug-ins.

    Free Open Source Linux Android

    GNU IceCat icon
  • Ungoogled Chromium

    A Google Chromium variant for removing Google integration and enhancing privacy, control, and transparency A number of features or background services communicate with Google servers despite the absence of an associated Google account or compiled-in Google API keys. Furthermore, the normal build process for Chromium involves running Google's own high-level commands that invoke many scripts and utilities, some of which download and use pre-built binaries provided by Google.

    • 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. JohnFastmanMar 2017 • 18 agrees and 8 disagrees Disagree   Agree
    • 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. Guest • Jul 2020 Disagree   Agree
    • 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. Guest • Jun 2019 • 8 agrees and 15 disagrees Disagree   Agree

    Free Open Source Mac Windows Linux

    Ungoogled Chromium icon

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