Image File Browser is a class that can be used to let the user browse and pick images stored in the server. It uses an AJAX based user interface to avoid page reloading when the browsing display is updated. It requires prototype.js and the scriptaculous library (scriptaculous.js, unittest.js, effects.js).
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.