[IbJacked]

I also use Ghostery and Adblock Plus, QuickJS (provides a toolbar button + hot-key for toggling JS support), and enabled "click to activate plugins".

I've tried not blocking, but on my 4 yr old MBP (Core 2 Duo) all the beacons, social buttons, flash ads, etc. simply slow my browser down to the point of frustration, particularly when scrolling.

Much of it is Firefox's fault though, as Safari scrolls smoothly on most of the sites that give me trouble in Firefox. I'm just not willing to give up my tagged bookmarks (even though I would like to, as now the bookmark syncing has become slow enough to make scrolling while syncing nearly unbearable... I might have a bookmark addiction;).