firefox wont start

[rfjones]

I have firefox 2.0 on fc5; when first installed it works fine
after a while it wont start; reinstall fixes the problem
I get the error message below
What do I need to do to remedy this erratic behaviour
TIA
rfjones

which: no wxdfast in
(/usr/jdk/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/X11R6/bin:/usr/jdk/jre/bin:/usr/local/ant/bin:/var/lib/pgsql/bin:/opt/openoffice.org2.1_sdk/linux/bin:/usr/local/Acrobat5/bin)
which: no kget in
(/usr/jdk/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/X11R6/bin:/usr/jdk/jre/bin:/usr/local/ant/bin:/var/lib/pgsql/bin:/opt/openoffice.org2.1_sdk/linux/bin:/usr/local/Acrobat5/bin)
which: no gwget in
(/usr/jdk/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr