Page Reloads?

I noticed this last night, and am seeing it today as well. I use Mozilla, and am now seeing multiple page reloads when I go to various sub-fora. Never seen this before, just wondering if something changed recently that would cause this. I'm running with FlashBlock, but not AdBlock, is the ad at the page bottom causing this (currently getting a lot of TMobile Sidekick ads)? My usual Org browsing is done by going to the various sub-fora in one window, and opening new windows per thread viewed. Those thread windows also multi-load at times.
https://img371.imageshack.us/img371/2914/reloadsno6.jpg

Not a big deal (it does mess with the back/forward buttons), just curious as to why this changed all of the sudden.

Edit-> Pretty sure this is ad-related. Doesn't happen when the banner gets flash-blocked, but does when I get a Sidekick or Yaris ad. AdBlock FTW...

hmm, can't help you with that, but, on a very related note, be careful with adblock; it's crashing my firefox like a *****, all the time. And I do keep Firefox updated, downloading latest patches/versions of AdBlock as well, etc. But since a couple of updates ago, it's been really, really, really bad for me. Just a heads-up.