I still have the very annoying, although infrequent, problem of when I click on a tab, the page opens in a new window (instead of right where the tab is). It doesn’t happen often, but still it’s a pain in the neck. And it doesn’t seem to matter what the website or page is when it happens. I was hoping this new update would have solved the problem. Anyone else having the same trouble?
If you mean “link” when you say “tab”, maybe this will help.
http://www.ghacks.net/2009/07/03/force-firefox-to-open-links-in-same-tab/