http://bugzilla.mozilla.org/show_bug.cgi?id=101055
There was some real choice feedback from some of the users here:
No driver since my B/W G3 was released has been of any help. My pleas to ATI have fallen on deaf ears. They suggested I make sure my monitor was plugged into the graphics card. I hope Apple doesn't ever make the ATI mistake again.
I agree, it's probably not just Mozilla (another problem involving bookmark-caused crashes has also occurred on Opera after importing my lengthy bookmark list from Mozilla). But, apparently, it's up to you clever folks to fix it if it's to be fixed, because ATI doesn't give a damn.