Web browsers based on Firefox

Mozilla Firefox
Main article: Mozilla Firefox
Mozilla Firefox is a free and open-source web browser made by Mozilla Foundation and Mozilla Corporation.
Firefox uses the Gecko and SpiderMonkey engine to load web pages. Both engines use the newest standards, making it easier for others to be used as a base. Firefox in iOS, however, does not use the said engines.
Firefox was created in 2002 by Mozilla community members. Even back in early testing, it was praised for speed and other features, as compared to its major competitor Internet Explorer 6.
List of web browsers based on Firefox
Listed below in alphabetical order, are the web browsers that are based on Firefox.
Cliqz
Cliqz was a privacy-focused search engine and web browser made by Cliqz GmbH. It was available for desktop, mobile, and as an add-on for Firefox.
It came with an anti-tracking feature and its search engine that uses its list of web pages to give search bar suggestions.
On April 29, 2020, Cliqz said that it would end development for its browser and search engine.
CometBird
CometBird was a web browser based on Firefox, made by BitComet. It works with Windows 98 up to Windows 10.
It has a bookmark auto-sync, which helps to use the bookmarks with many devices. It also had a built-in media downloader and translator.
By 2015, its development ended.
Comodo IceDragon
Comodo IceDragon was an open-source web browser made by the Comodo Group for Windows.
IceDragon has SiteInspector that checks if a web page is malicious before the user visits it.
It also uses Comodo's Secure DNS service instead of using the DNS of the internet service provider. The Secure DNS aims to load pages faster and make browsing safer as it blocks malicious website connections live.
GNU IceCat
GNU IceCat (called GNU IceWeasel back then) is a completely free version of Mozilla Firefox made by the GNU Project.
Mozilla makes free and open-source software, but some files are non-free. The GNU Project aims to keep up IceCat with Firefox Extended Support Releases while replacing non-free files with free ones.
It is available for IA-32, x86-64, and PowerPC architectures. The current copies are only for Linux and macOS, with unofficial copies for Windows and Android.
Librewolf
Librewolf is a free and open-source browser with a focus on privacy and security.
Some features from Firefox, like Pocket are turned off. It also removes telemetry (gathering user data) and has uBlock Origin pre-installed.
It is available for Linux, Windows, and MacOS. There are also some unofficial builds for FreeBSD and OpenBSD.
Pale Moon
Pale Moon is an open-source web browser, with a focus on customization. It is available for Microsoft Windows, FreeBSD, macOS and Linux.
Pale Moon has become different from Firefox in a lot of ways:
It uses Strata design from Firefox 4-28
Supports XUL and XPCOM extensions
Supports "Complete Themes" that can change all designs of the browser
Supports NPAPI plugins
Replaces Gecko engine with Goanna (fork)
Always runs in single-process mode
Waterfox
Main article: Waterfox
Waterfox is a free and open-source browser, focused on speed and privacy. It was first made for 64-bit systems, back before when Firefox was only for 32-bit. It also works with Chrome and Opera extensions. It turns off telemetry and Pocket by default.
Waterfox Classic
Waterfox Classic is a copy of Waterfox for older systems. It uses an older copy of Gecko that works with XUL and XPCOM add-ons. It is currently being kept up with security changes from Waterfox and Firefox ESR.