There are at least three things a respectable web site should never do: Resize browser windows via JavaScript Bring browser windows/tabs to the front via JavaScript Open links in new "_blank" windows

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. GlimmerBlocker is implemented as an http proxy, so the stability of Safari isn't compromised because it doesn't use any hacks. It is even compatible with all other browsers.

Safari's debugging abilities are poor, often a good alternative is to get the site working in Firefox properly first and then fix the remaining bugs in Safari. Safari does have a "Debug" menu, although it is hidden by default. To display the debug menu, in a terminal window, type: