Firefox will not open Version 4.01 (tried to download new version), on MacBook Pro running 10.6.8. Safari and Chrom both work OK

I cannot get on-line with Firefox. It simply will not open any page. I'm told it cannot make a connection. And yet both Safari and Chrome work fine, hence it is not a connection problem.
Moreover, when I started with Chrome, it offered me the option to export bookmarks, but only from Safari. Firefox never appeared in the import box
I was using Firefox 4.01. I tried to download the new version, dragged it to Applications, but 4.01 remains in situ. I work on a MacBook Pro running 10.6.8

Cannot connect after upgrading Firefox
* https://support.mozilla.com/en-US/kb/Cannot%20connect%20after%20upgrading%20Firefox
Firefox cannot load websites but other programs can
* https://support.mozilla.com/en-US/kb/Firefox%20cannot%20load%20websites%20but%20other%20programs%20can
Check and tell if its working.

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