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With new update I can no longer open a 2 nd. tab.

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When I click on the plus sign nothing happens. The only time I can get more than one tab, is if I open e-mails. I have Windows 7

When I click on the plus sign nothing happens. The only time I can get more than one tab, is if I open e-mails. I have Windows 7

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Try see if this happens in safe mode:

Maybe your localstore.rdf is corrupted, try unhide the hidden files and folder, go to your profile folder, close firefox, delete or rename the localstore.rdf file and restart Firefox.

Also:

Modified by Diego Victor