Webpages jumping up and down

I recently upgraded to Safari 6 and decided to add AdBlock and AllPagesZoom to avoid annoying ads and always zooming each web page to suit my little girly man eyes.

Now when I load a page, say Huffpost, as I'm trying to read a story the page jumps up and moves down a small but irritating amount. When this happens, the bottom scrollbar goes from right to left, long to very short over and over.

Anyone else have this happen?

iMac mid 2011 2.5 i5, Safari 6, 10.7.4 Lion, AdBlock 2.5.38 and AllPagesZoom 1.0.7