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HTTP based ad blocker for Mac OS X

No hacks, no instability
Upgrade Safari whenever you like, no need to wait for an upgraded hack

GlimmerBlocker is no longer maintained and should no longer be used as web sites have migrated from using plain http to using https (i.e. encrypted) which prohibits modification by a proxy unless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

Bug fixes and better upgrader

Fixed problem with network settings not being activated when activating GlimmerBlocker. This made GlimmerBlocker unable to block ads when you reactivated GlimmerBlocker.

Complete new updater which will dramatically reduce the amount of data to download (for following updates).

Fixed bugs which made WebDav publishing dialog (and others) likely to hang or crash. Reported by Andreas Maks.

Digits in top-level domains are now allowed. Reported by Brody Hoskins.

Port number is now included in forwarded host header.

Improved loading of the jvm. If this version prompts you to install a java runtime, please tell me at

Detect application/smil as XML. Reported by Rasmus Bengtsson.

Use ISO-8859-1 when sending http headers to browser. Reported by Daniel Brauer.

Workaround for servers which sends space before colon in http headers. Reported by a contributor.

Smart quotes are now disabled in filter code editing.

Fix host header used for proxy requests as some client software doesn't use the wanted hostname in the host-header but only in the full URL. Reported by Thomas Tanner.

Improved IPv6 connectivity test class and logging.

Release date

Version 1.6.5 was released 2015-02-01

list of all release notes.