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It crashes constantly. why should I use firefox 4?

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Every time I try to start 4.0 it crashes. No message just doesn't open. I have tried re-installing it several times. No help. I stopped the service, etc. but doesn't help. I started with the first Netscape. I am a Computer Consultant and a techie. I will have to stop suggesting my clients use 4.0 as I can't get it to run properly. Really disappointed in this release.

Every time I try to start 4.0 it crashes. No message just doesn't open. I have tried re-installing it several times. No help. I stopped the service, etc. but doesn't help. I started with the first Netscape. I am a Computer Consultant and a techie. I will have to stop suggesting my clients use 4.0 as I can't get it to run properly. Really disappointed in this release.

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https://support.mozilla.com/en-US/kb/Firefox+crashes#Getting_help_with_your_crash

Type about:crashes in the URL bar and hit Enter.
Click the hyperlinks to bring up the Crash Report pages and copy'n'paste the URL of each of those reports into the message box here. We'll see if we can help you figure out what is causing those crashes to happen.