Open Source Mozilla Firefox Alternatives

    The best open source alternative to Mozilla Firefox is Pale Moon, which is both free and Open Source. 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 Brave (Free, Open Source), Waterfox (Free, Open Source), Chromium (Free, Open Source) and Firefox Nightly (Free, Open Source).

    This page was last updated Sep 27, 2021

    1. 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!.
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      Pale Moon vs Mozilla Firefox opinions
      Almost everyone thinks Pale Moon is a great alternative to Mozilla Firefox.
       all • positive • negative      relevance • date
      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).
      Top positive comment  over 4 years ago

      20
      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
      Top positive comment  over 4 years ago

      11
      Old looking UI. It needs to be updated.
      Top negative comment  over 1 year ago

      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
      Negative comment 28 days ago

      0
      sanjeetk4 It is really light and fast.
      Positive comment about 2 months ago

      0
      jakeBeefiller Privacy and security focus.
      Positive comment 7 months ago

      0
      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
      Positive comment about 1 year ago

      2
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      7 of 20 comments
    2. 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?
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      Brave vs Mozilla Firefox opinions
      Most users think Brave is a great alternative to Mozilla Firefox.
       all • positive • negative      relevance • date
      It's really really nice and fast, but is still in very early development and lacking a lot of features
      Top positive comment  over 4 years ago

      5
      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.
      Top positive comment  11 months ago

      0
      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.
      Top negative comment  almost 2 years ago

      44
      Kedman The best of the best : no ads, very fast, very safe and very free and work with chrome extension
      Positive comment 4 months ago

      1
      enricoce it's faster, more secure, sync what you want through different platforms, safe.
      Positive comment 6 months ago

      0
      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.
      Negative comment 8 months ago

      2
      fast, bulit-in support for tor peer to peer sync, etc.
      Positive comment 10 months ago

      1
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      7 of 15 comments


    3. 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?
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      Waterfox vs Mozilla Firefox opinions
      Almost everyone thinks Waterfox is a great alternative to Mozilla Firefox.
       all • positive • negative      relevance • date
      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
      Top positive comment  about 4 years ago

      21
      JohnFastman 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.
      Top positive comment  over 4 years ago

      14
      Dated when compared to actual Firefox, some extensions doesn't work properly due to it being based on a old version of Firefox.
      Top negative comment  almost 2 years ago

      5
      retroplayeryt It's like the Chromium, but for Firefox.
      Positive comment 7 months ago

      0
      Schnatt_App clean striped open-source alternative if you seek a browser without any telemetry features
      Positive comment over 1 year ago

      6
      Please keep it updated quicker vs Firefox. That is my only complaint.
      Positive comment almost 2 years ago

      1
      khanhlong17112000 The 64 bit version of this browser is very lightweight. In fact, it can compare with 32 bit version of another browser.
      Positive comment almost 2 years ago

      1
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      7 of 16 comments
    4. 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: http://crportable.sourceforge.net Windows binaries are available at:...
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      Chromium vs Mozilla Firefox opinions
      Almost everyone thinks Chromium is a great alternative to Mozilla Firefox.
      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.
      Top positive comment  over 4 years ago

      26
      SiliconeValley Chromium is most likely the heart of Google Chrome, Opera and some browsers without fancy features.
      Top positive comment  about 5 years ago

      4
      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.
      Top negative comment  about 1 year ago

      4
      By default, it doesn't support DRM because the missing Widevine plugin/codec
      Negative comment over 1 year ago

      1
      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.
      Negative comment over 2 years ago

      18
      Full Webbrowser, Source of Chrome, has html5 / css3 / js / addons / bookmarks / sync, etc. So, why not? It seems there was a Troll on this page...
      Positive comment about 5 years ago

      0
      jacksarrocco Chromium is not a ready-for-the-consumer software. It is a open source project that needs to be implemented to make it work.
      Negative comment about 5 years ago

      -77
    5. 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.
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      Firefox Nightly vs Mozilla Firefox opinions
      Most users think Firefox Nightly is a great alternative to Mozilla Firefox.
      If you want a more updates and If you are tester, you liked her!
      Positive comment over 1 year ago

      4


    6. 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.
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      Firefox Developer Edition vs Mozilla Firefox opinions
      Almost everyone thinks Firefox Developer Edition is a great alternative to Mozilla Firefox.
      sarpertoksoz offical edition of firefox
      Positive comment about 3 years ago

      0
      axy_david If you have issues with Firefox not being fast enough but don't wanna go Chrome try this! Also faster than Chrome.
      Positive comment over 3 years ago

      8
    7. Falkon, formerly QupZilla, is a QtWebEngine based cross-platform web browser. It aims to be a lightweight web browser available through all major platforms.
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      Falkon vs Mozilla Firefox opinions
      Most users think Falkon is a great alternative to Mozilla Firefox.
      Brings aut of the box what you need and don't support datastealing apps
      Positive comment almost 3 years ago

      -1
    8. 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.
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      SeaMonkey vs Mozilla Firefox opinions
      Most users think SeaMonkey is a great alternative to Mozilla Firefox.
      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. ;)
      Top positive comment  over 2 years ago

      4
      Less resource-intensive than Firefox. Generally fast and stable.
      Top positive comment  over 4 years ago

      3
      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!
      Positive comment 4 months ago

      0
      kompowiec2 Lighweight and is without soros Support.
      Positive comment about 4 years ago

      -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.
      Positive comment about 6 years ago

      2
      Within Linux works much more fast and compatible with Firefox extensions
      Positive comment about 6 years ago

      2
    9. 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.
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      Almost everyone thinks GNU IceCat is a great alternative to Mozilla Firefox.
    10. A Google Chromium variant for removing Google integration and enhancing privacy, control, and transparency
      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.
      Positive comment over 4 years ago

      15
      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.
      Negative comment about 1 year ago

      -3
      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.
      Negative comment over 2 years ago

      -15
    Showing 10 of 90 alternatives