FEBE (Firefox Environment Backup Extension) allows you to quickly and easily backup your Firefox extensions. In fact, it goes beyond just backing up -- It will actually rebuild your extensions individually into installable .xpi files. Now you can easily synchronize your office and home browsers.
Lobo [download] is an open source web browser that is written completely in Java.
Lobo is being actively developed with the aim to fully support HTML 4, Javascript and CSS2. Lobo also supports direct JavaFX rendering.
The general goal of the Lobo browser effort is to produce a browser that is fast, complete, easy to extend, feature-rich and secure.
Ever wanted to test your website in various versions of Internet Explorer?
It is possible to run Internet Explorer in standalone mode without having to over-write previous versions thanks to Joe Maddalone who came up with a way of achieving that in November 2003. Basically, Internet Explorer is run by exploiting a known workaround to DLL hell - which was introduced in Windows 2000 and later versions - called DLL redirection.