(towbar: You just wait until you've typed for 10 minutes, finding and linking in other threads, proofread, corrected, and polished a post--you hit the "post" button--and then realize that in the 2 minutes since you'd looked up your last webboard URL and the time that you hit the GO button, that the forum had completely stopped responding. No, better yet, wait until the 2nd or 3rd time that this has happened. THAT'LL get your goat, I guarantee you...
)
jjn - You're not accidentally doing a "ctrl + mouse scroll-wheel", are you? That bounces fonts around pretty good in Firefox, 3 or under. (same-same as ctrl + keypad +/-, for that matter, only much quicker).
There doesn't *seem* to be anything in this webboard's CSS that would in itself cause font resizing, anyhow.
BittMann