That came later, after they decided that they preferred politics to market share. (sometime around 2008-09, judging from the TIFF support bug: https://bugzilla.mozilla.org/show_bug.cgi?id=160261#c39)
I missed that cluster of madness for firefox, I guess. Had I known that Mozilla would turn out this way, I would never have donated money. My name is on their full-page NYT ad and poster.
I wonder if they'd give me a refund?