Firefox has suddenly stopped connecting on one of three user accounts on the same computer. That account still connects with Safari - but not Firefox. A clean-install has not solved the problem. Help?

Three user accounts on the same computer all link to a single copy of Firefox 3.6.8 - but one of them has suddenly lost its ability to use the program. Firefox opens in that account, but it cannot connect to the Internet. 'Done' appears at the lower left of a blank Firefox page [it's set to load a blank page initially], as though a page had finished downloading ... but Firefox does not actually generate any Internet activityx.
Previously, the Firefox connection for this account was smooth and reliable. I haven't added, upgraded or downloaded any new programs, nor made any other computer changes in recent weeks or months.
Puzzlingly - that same account still connects successfully to the Internet via Safari. And the other accounts on the same computer continue to use Firefox with no problem - including a test user-account that I set up today to help troubleshoot the problem. The blockage is restricted solely to Firefox with that one user account.
Following your Support page instructions, I did a clean-install of Firefox 3.6.8, removing both the existing Firefox 3.6.8 and the Library/Application Support/Firefox folder. Going the extra mile, I checked all accounts to be certain that no Firefox folders remained in any of them - then emptied the Trash and restarted before installing a freshly downloaded 3.6.8. But blimey - the blockage still persists for that one user account.
Firefox shows no visible cookies that might influence the connection. [It's set to delete all cookies upon closing anyway.] And I see no obvious instructions in Mac's firewall or any software program to refuse access to Firefox. The computer is stand-alone, not networked. And in any case, Firefox works just fine in the two other user accounts.
Deleting the hobbled user account is not feasible. So what is causing this roadblock? Did I miss a step in the clean-install? How can that account resume using Firefox?
Thanks in advance for your advice.

If files already have been downloaded then remove the files in the updates and updates\0 folder.
You can also delete active-update.xml and possibly updates.xml (stores the update history).
* http://kb.mozillazine.org/Software_Update (Software Update not working properly)
C:\Users\<user>\AppData\Local\Mozilla\Firefox\Mozilla Firefox\updates
(%LOCALAPPDATA%\Mozilla\Firefox\Mozilla Firefox)

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