Link Launcher is a GUI tool that helps you choose the Web browser in which to open a link. It is called whenever you follow a link from an application other than a Web browser, and it presents you with a choice of the available Web browsers, so that you can use the browser that is appropriate for that particular link.
user_info is a class to retrieve information about the browser the user is using to access the current site script. It can analyze the user agent string sent by the browser in the current HTTP request and extracts the type of browser, user machine operating system, user machine IP address, accepted character set encoding, language name, and whether the user is a spider/bot.
CHM Reader is an extension to allow Firefox to read Compiled HTML (.chm) files. After installation, with "File | Open CHM File", you can open a CHM file in Firefox. With "View | Sidebar | CHM Reader" or "Ctrl-E", a sidebar that contains topics and an index of the CHM files will be shown.
Crossfire is a Firefly Media Server client written for the Apple iPhone and the iPod touch. It has support for streaming, browsing, and searching music content. It supports both Mobile Safari and FireFox, but can be configured for various other devices such as Windows Mobile, Symbian, etc.