GlimmerBlocker is implemented as an HTTP proxy, so the stability of Safari isn\'t compromised because it doesn\'t use any hacks. GlimmerBlocker is even compatible with all other browsers.The problem with other ad-blockers for Safari is that they are implemented as awful hacks: as an InputManager and/or ApplicationEnhancer. This compromises the stability of Safari and very often create problems when Apple releases a new version of Safari. You\'ll always be able to upgrade Safari without breaking GlimmerBlocker (or waiting for a new release); and you\'ll be able to upgrade GlimmerBlocker without upgrading Safari. This will make it a lot easier to use the beta versions of Safari and especially the nightly builds of WebKit. Because GlimmerBlocker doesn\'t hack Safari, there is a few things it isn\'t able to do: adding a block by right-clicking an image, stopping pop-unders, and filtering cookies from 3rd party sites.