Why won't new version 4.0 open on my desktop while version3.6.17 works fine. When I check the processes running on the computer the firefox is running but it won't open on the desktop(monitor)

When I updated firefox from version 3.6.16 to 4.0 the program would not open on the desktop after I double-clicked the short cut on the desk top. I checked the processes running on the computer and it showed firefox running. I followed the short cut to its file and clicked on the executable file with the same result(it won't open). I went back to the previous version and it works fine. What could be the problem?

Hey djclark24,
Have you tried starting Firefox in Safe Mode? Hold down "shift" while Firefox is starting up. If the crash doesn't happen in Safe Mode, you should read [[Troubleshooting extensions and themes]].
There is also a lot of useful stuff in the [[Firefox crashes]] Knowledge Base article.
You could also try [https://support.mozilla.org/en-US/kb/Managing-profiles?s=create+a+new+profile&r=2&e=es&as=s#w_creating-a-profile Creating a new profile].
Hopefully this helps!

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