Firefox Doesnt Work Anymore

[Me2resh Lists]

Hi all,
i have just installed fedora core 5 yesterday
after the fresh install, i did yum update
all the updates were downloaded and installed successfully, and since that
firefox doesnt work anymore, when i click on its icon, i get in the lower
bar "openning web browser" then it disappears and nothing happens, i
uninstalled firefox and installed it again, but the same problem
i opened mozilla and it worked successfully, but i need firefox
can anyone help me ?
any help would be appreciated
thanks
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