Privoxy is the current incarnation of Junkbuster. Privoxy has the ability to randomly modify web pages before sending them to the browser — for example, remove <blink> or <img> tags.
Just like its parent, Privoxy cannot do persistent connections. Additionally, it buffers whole pages before sending them to the client, which significantly adds to its latency.
WWWOFFLE is probably a better choice than Privoxy if you need page rewriting.