Absolutely the best ad-blocker I've used, and I've used them all! Adblock/PithHelmet are hacks into Safari, and potentially breaks with every Safari upgrade. I've tried using a stylesheet, those are ugly and annoying to update.

Then comes GlimmerBlocker, installed as a System Preference! The default subscriptions work beautifully, and you can make your own custom filters! The best part for me is that I've been able to produce my own filters, then host them on my webDAV server for others (friends/family) to subscribe to in their GlimmerBlocker!

This makes sharing filters easy as pie!!!! The author unfortunately is not currently taking donations, and the app is free! Very responsive, and has fixed every single issue I've had with it (compatibility issues with iSpQ and a few minor glitches); for my purposes, this app is now bug free! :)