Opera Developer Browser

Opera Developer Browser is based from Opera but it gets new (unstable) features first.

Free
Windows
Linux
Mac

Advanced user? Experiment with Opera developerThis is the earliest experimental rollout of our browser innovations, and not all of the experiments will move on to the next stages. Please note because the new features in Opera developer are so raw, they can be unstable and even crash your browser. Test with caution! This is the version for you only if you’re a developer, advanced user or enjoy living on the edge.

Links to official Opera Developer Browser sites

Official Website
Twitter

Features

The Best 15 Opera Developer Browser Alternatives

based-on-firefox filter is active.

269 Like

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...

Free Open Source Mac OS X Windows Linux OpenBSD

Firefox extension Portable Privacy protection Anonymity Privacy Protected Based on Firefox Tracker blocker Application Blocker Embedded debugger Bloatware Remover Surf Anonymously Built in VPN Built in Ad blocker Traffic Analysis IMAP debugging Proactive Protection
253 Like

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.

Free Open Source Windows Linux Android

Extensible by Plugins/Extensions Legacy addons support Portable Lightweight Plugin support Support for Firefox extensions Based on Firefox Optimized for Windows Based on Goanna engine Optimized Firefox
169 Like

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.

Free Open Source Windows Linux Android Android Tablet Mac

Legacy addons support Portable Optimized for fast boot Support for Firefox extensions Based on Firefox Support for 64 bit Optimized for Windows Specific for 64 Bit Optimized Firefox
113 Like

Konqueror

Konqueror is an Open Source web browser powered by the KHTML rendering engine (and optionally Webkit) which means it supports the latest web standards such as HTML5, Javascript, CSS3, and others.

Free Open Source Windows Linux BSD Mac KDE

Integrated PDF Viewer Based on Webkit engine Based on Firefox
97 Like

K-Meleon

K-Meleon is an extremely fast, customizable, lightweight web browser based on the Gecko layout engine developed by Mozilla which is also used by Firefox.

Free Open Source Windows

Customizable Extensible by Plugins/Extensions Based on Gecko engine Lightweight Based on Firefox
92 Like

Firefox Developer Edition

Firefox Developer Edition brings your core dev tools together with some powerful new ones that will extend your ability to work across multiple platforms from one place. It’s everything you’re used to, only better. Available in 64-bit.

Free Open Source Windows Linux Mac

Portable Based on Firefox
80 Like

Cyberfox

cyberfox is a 64-bit version (32-bit download also available) of mozilla firefox , compiled with microsoft visual studio 2012, windows 8 sdk & intel composer xe 2013. making it faster than other browsers.

Free Open Source Windows Linux

Portable Based on Firefox Support for 64 bit Specific for 64 Bit
70 Like

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.

Free Open Source Windows Linux Android Mac

Extensible by Plugins/Extensions Tabbed browsing Based on Firefox Built in Ad blocker
30 Like

Comodo IceDragon

Comodo IceDragon is a fast and secure internet browser based on Mozilla Firefox and infused with Comodo security.

Free Windows

Portable Security focused Based on Firefox
20 Like

Firefox Focus

Firefox Focus is the Mozilla-made browser that considers your privacy first and foremost.

Free Open Source Android iPhone Android Tablet iPad

Privacy focused Privacy protection Privacy Protected Based on Firefox Tracker blocker No Tracking Built in Ad blocker
20 Like

Cliqz

CLIQZ is a Firefox-based browser with a built-in quick-search and a new Anti-Tracking technology for better privacy protection.

Free Mac OS X Windows Linux Android iPhone Android Tablet iPad Firefox

Firefox extension Privacy Protected Based on Firefox No Tracking
11 Like

BitBox

The Virtual Environment for secured and comfortable Web Browsing: On the basis of a “Browser-in-the-Box” concept a virtual machine is provided with a reduced operating system and a web browser encapsulated therein.

Free Windows Linux

Based on Chromium Based on Firefox
9 Like

Light Firefox

Light Firefox is a light browser based on Mozilla source code. Many components are slimmed down, so it can start faster and use less memory. By default, Light can run along with Firefox. Both x86 and x64 builds are available.

Free Open Source Windows Linux

Extensible by Plugins/Extensions Tabbed browsing Lightweight Based on Firefox
7 Like

Basilisk

Basilisk is a free and Open Source XUL-based web browser, featuring the well-known Firefox-style interface and operation.

Free Open Source Windows Linux

Extensible by Plugins/Extensions Legacy addons support Tabbed browsing Support for WebExtensions Support for Firefox extensions Based on Firefox
2 Like

PreFox

prefox is an early proof-of-concept web browser for webos based on the the same source code as mozilla firefox for mobile.

Free Open Source HP webOS

Tabbed browsing Based on Firefox

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Opera Developer Browser

Links to official Opera Developer Browser sites

Features

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The Best 15 Opera Developer Browser Alternatives

Tor Browser

Pale Moon

Waterfox

Konqueror

K-Meleon

Firefox Developer Edition

Cyberfox

GNU IceCat

Comodo IceDragon

Firefox Focus

Cliqz

BitBox

Light Firefox

Basilisk

PreFox

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