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.
Pandorabots Chat Bot Interface is a learning tool for implementing AJAX to communicate between the browser and a server. The chat bot interface communicates via XML with a free chat bot you create and host at pandorabots.com. The client script controlls a div that records your ongoing conversation. The final product is an embedded chat bot in your Web site.
Firekeeper is an intrusion detection and prevention system for Firefox. It is able to detect, block and warn the user about malicious sites. Firekeeper uses flexible rules similar to Snort ones to describe browser-based attack attempts. Rules can also be used to effectively filter different kinds of unwanted content.
The Mechanize library is used for automating interaction with websites. It automatically stores and sends cookies, follows redirects, can follow links, and submits forms. Form fields can be populated and submitted. Mechanize also keeps track of the sites you have visited as a history.