Can be run as an "intercepting" proxy, which obviates the need to configure browsers individually. Sophisticated actions and filters for manipulating both server and client headers. Can be chained with other proxies. Integrated browser based configuration and control utility at http://config.privoxy.org/ (shortcut: http://p.p/). Browser-based tracing of rule and filter effects. Remote toggling. Web page filtering (text replacements, removes banners based on size, invisible web-bugs, JavaScript and HTML annoyances, pop-up windows, etc.) Modularized configuration that allows for standard settings and user settings to reside in separate files, so that installing updated actions files won't overwrite individual user settings. Support for Perl Compatible Regular Expressions in the configuration files, and a more sophisticated and flexible configuration syntax. Improved cookie management features (e.g. session based cookies). GIF de-animation. Bypass many click-tracking scripts (avoids script redirection). Multi-threaded (POSIX and native threads). User-customizable HTML templates for all proxy-generated pages (e.g. "blocked" page). Auto-detection and re-reading of config file changes. Improved signal handling, and a true daemon mode (Unix). Every feature now controllable on a per-site or per-location basis, configuration more powerful and versatile over-all. Many smaller new features added, limitations and bugs removed.