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Thanks for the fast reply! Maybe I'll create a short greasemonkey script for the site that will increase font sizes on certain sections so I won't have to change *all* the fonts using firefox. After disabling adblock the problem still persists because the <div> area where the ad sits is still in place and forcing the first comment to the left a bit.
There was a nice big uproar recently about an article I wrote on my blog regarding some tongue-in-cheek comments about what I thought about people who use adblockers, so suffice it to say I'm not the type of person who goes out of his way to make amenity fixes for people who use them!

But you're right; it's the div block that the ad sits in that is the problem!
The back/forward button thing can get a bit annoying, and I forget that they don't work on file pages every day, but when the page needs to display as much information as it does I decided it was the best way. I quite like the tabbed navigation.