[dwm] firefox 3.0 shaking

Hi,
I'm running dwm-4.2(probably should upgrade, but anyway)
I just installed the new version of firefox-3.0 and it seems to start
shaking(like it's struggling to resize) whenever I open a new window
in the same tag as it and shaking continues for a short time after I
close the additional window. I'm going to file a bug with mozilla but
thought I'd see if anyone else using dwm had similar problems. As it
doesn't happen on fluxbox.
Any one had similar experiences?

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