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Mozilla Firefox is a fast, full-featured Web browser. Firefox includes pop-up blocking, tab-browsing, integrated Google search, simplified privacy controls, a streamlined browser window that shows you more of the page than any other browser and a number of additional features that work with you to help you get the most out of your time online.

Quantum is Mozilla’s project to build the next-generation web engine for Firefox users, building on the Gecko engine as a solid foundation. Quantum will leverage the fearless concurrency of Rust and high-performance components of Servo to bring more parallelization and GPU offloading to Firefox.
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LibreWolf is an independent “fork” of Firefox, with the primary goals of privacy security and user freedom. It is the community run successor to LibreFox.

LibreWolf is designed to minimize data collection and telemetry as much as possible. This is achieved through hundreds of privacy/security/performance settings and patches. Intrusive integrated addons including updater, crashreporter, and pocket are removed too.

LibreWolf is NOT associated with Mozilla or its products.
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Thunderbird is a free, open-source, cross-platform application for managing email and news feeds. It is a local (rather than a web-based) email application that is powerful yet easy-to-use. Thunderbird is developed, tested, translated and supported by the folks at Mozilla Corporation and by a group of dedicated volunteers. Thunderbird gives you control and ownership over your email. There are lots of add-ons available for Thunderbird that enable you to extend and customize your email experience.

Thunderbird gives you IMAP/POP support, a built-in RSS reader, support for HTML mail, powerful quick search, saved search folders, advanced message filtering, message grouping, labels, return receipts, smart address book LDAP address completion, import tools, and the ability to manage multiple e-mail and newsgroup accounts.

Tabbed email
An Archive feature similar to the one in GMail
Lightning fast search
Smart folders
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SeaMonkey原来是Mozilla基金会内部一个负责管理工作的小组的名称。但是从现在起，SeaMonkey有了新的含义：SeaMonkey是一个社区项目，它致力于在从过去的“Mozilla浏览器套件”中分离出来的代码的基础上，开发可供使用的浏览器套件。

SeaMonkey 将替代Mozilla基金会原先的“Mozilla浏览器套件”的开发。——从用户角度来说，它将继承Mozilla浏览器套件的大部分功能，包括一个网页浏览器、一个高级邮件程序、一个IRC聊天客户端和一个HTML编辑器。SeaMonkey将继承Mozilla浏览器套件的衣钵，成为新一代的网络集成工具。
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Betterbird is a fine-tuned version of Mozilla Thunderbird, Thunderbird on steroids, if you will. Betterbird aims at providing a better user experience by fixing annoying bugs in Thunderbird and implementing new features. Please refer to this feature table for examples. This should give you an impression of where the project is headed.

Betterbird is a soft fork of Mozilla Thunderbird. Soft fork means that it is closely following the Thunderbird Extended Support Releases (ESR) therefore avoiding the mistakes of other forks which quickly lost track of upstream Thunderbird, thus opening users up to security vulnerabilities.

Is Betterbird for me?
If you like Thunderbird but are discouraged by too many bugs, then give Betterbird a try. It is 100% compatible with Thunderbird’s ESR version. You can install the same dot release of Thunderbird in parallel and switch between Betterbird and Thunderbird on the same profile without problems and without needing the -allow-downgrade command line switch.
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Bringing together all kinds of awesomeness to make instant messaging better for you.
Talk to all your friends
With Instantbird, you can now talk to all your friends with a single application!
AIM, Yahoo, MSN, Google Talk, Facebook and even Twitter are supported!
Trouble free
Instantbird has been designed with stability and simplicity in mind.
You will enjoy its clean clutter-free user interface: nothing will distract you from your conversations!
No ads, you won’t be annoyed by unwanted content.
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