Reaper-X informs us that there is an updated version of Webcleaner to be had. Version 2.4 of this open-source content filtering program has been released. According to Sourceforge.net, here is a little of what Webcleaner will do:
It removes adverts, compresses documents, deanimates GIFs, can use SquidGuard filter lists, and more.
Reaper-X points out that it appears that they fixed the past issues with Firefox :). You can go here to download it and try it out for yourself.