GlimmerBlocker is no longer maintained and should no longer be used as web sites have migrated from using plain http to using https (i.e. encrypted) which prohibits modification by a proxy unless you resort to install custom SSL certiticates on the client.
You should use a browser extension instead.
It was made as a hobby project during 2007-2008 by Peter Speck. It features both a custom http server and http client and a Mac OS X control panel.
Fixed hang when creating and editing rules by using the suspect pane. Reported by Łukasz Piestrzeniewicz.
Fixed problem with occasional hang in saving/loading preferences and other uses of sub-processes.
Download and install of java is no longer needed as GlimmerBlocker includes it.
Version 1.5.1 was released 2012-07-30