Firefox 4.01 has never started in my iMac with OS10.6.7, why?

About six times I have downloaded Firefox 4, each time I have tried to use it it has crashed on opening . I have never even seen the home page

That is because that Firefox 3.6.x version has been released later than the Firefox 4 version.
If you have problems with updating then easiest is to download the full version and trash the currently installed version to do a clean install of the new version.
Download a new copy of the Firefox program and save the DMG file to the desktop
* Firefox 4.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Firefox 3.6.x: http://www.mozilla.com/en-US/firefox/all-older.html
* Trash the current Firefox application to do a clean (re-)install
* Install the new version that you have downloaded
Your profile data is stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder], so you won't lose your bookmarks and other personal data.

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