Firefox 3.5, find (Ctrl+F) does not work

[Per olof Ljungmark]

* Output from 'uname -a'.

FreeBSD kreutzman.h.inter-sonic.com 7.3-STABLE FreeBSD 7.3-STABLE #0:
Sun May 23 08:53:20 CEST 2010
peo at kreutzman.h.inter-sonic.com:/usr/obj/usr/src/sys/KREUTZMAN  i386


* Date/time stamp from www/firefox35/Makefile.

3703 Oct 30 20:24 Makefile

* Where/when did the problem occur: configuring, building, or
        running firefox

running

* How can you reproduce the problem?

Start firefox and try to use Ctrl+F
You can enter a search phrase but the "Previous" "Next" and "Highlight
all" buttons are greyed out.