GlimmerBlocker is no longer maintained and should no longer be used as web sites have migrated from using plain http to using https (i.e. encrypted) which prohibits modification by a proxy unless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.

GlimmerBlocker did not only block requests but also allowed for adding custom css and javascript to the pages. It also allowed for modification of the page html before the browser receives the html, which made some modifications much easier than DOM based modifications.

OpenDNS and IPv6

In general OpenDNS works just fine, but for some reason, they return IPv4 adresses when a hostname only has IPv6 addresses. This makes e.g. ipv6.google.com fail.

You can test this by opening /Applications/Utilities/Terminal?.app and run the command:

host ipv6.google.com

Good output is like:

ipv6.google.com is an alias for ipv6.l.google.com.
ipv6.l.google.com has IPv6 address 2001:4860:a003::68

Bad output with IPv4 address is like:

ipv6.google.com is an alias for ipv6.l.google.com.
ipv6.l.google.com has address 67.215.65.132
ipv6.l.google.com has IPv6 address 2001:4860:a005::68