No Firefox loading

Hi all -

I'd appreciate any insights, instructions ... I have a Linpus system w/ 512 RAM and 8G SSD. Two days back, Firefox simply stopped working. I click on the icon, and there is a second of searching, but ultimately no browser. I found a couple of threads, and tried their solutions, but no joy. Some history of my diagnosis efforts below, in case they help.

Ideas?
Shawn

I tried following this thread:
viewtopic.php?f=5&t=10081&p=65039&hilit=firefox+won%27t+open#p65039

I've opened the terminal and typed in "firefox", but nothing.
I also typed "which firefox" and got
/usr/bin/firefox
Then I typed "grep web .config/xfce4/desktop/group-app.xml" and got
<app sequence="0">/usr/share/applications/linpus-web.desktop</app>
<app sequence="6">/usr/share/applications/edesktop/webmail.desktop</app>
Finally I tried "grep firefox /usr/share/applications/linpus-web.desktop" and
Exec=firefox
Icon=acs_firefox.png

Then I saw another thread:
viewtopic.php?f=5&t=5473&p=36269&hilit=firefox+won%27t+open#p36269
I tried their advice, though I had not installed FF3 ... and typed "ls -l /usr/bin/fire*" which gives me
-rwxr-xr-x 1 root root 6108 2008-6-12 01:35 /usr/bin/firefox

 

One possible problem is that FF creates a lockfile and it won't start if the lock file exists.
Look at .mozilla/firefox/default*/ in your home directory for a file (actually a symlink) called "lock". If it's there with FF not running, remove it.

 

I have the same problem. Remove the file .parentlock does not resolve this problem.
This append after a crash.

I have removed the directory profile; Firefox recreate a new directory but the file .parentlock come again. I dont understand why ?????