Everytime I click on a link, instead of loading it on the same page it opens a new tab.
Suddenly every time I click on a link, it opens it in a new tab i.e.; if I search yahoo from my home page, it opens yahoo in a new tab, then when I click on yahoo mail, it opens yahoo mail in a new tab, and then when I sign in, it opens yet another new tab, etc etc. I must have pressed something, but I don't know how to undo it.
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Try the Firefox SafeMode to see how it works there.
A troubleshooting mode, which disables most Add-ons.
(If you're not using it, switch to the Default Theme.)
- You can open the Firefox 4/5/6/7 SafeMode by holding the Shft key when you use the Firefox desktop or Start menu shortcut.
- Or use the Help menu item, click on Restart with Add-ons Disabled... while Firefox is running.
Don't select anything right now, just use "Continue in SafeMode."
To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut (without the Shft key) to open it again.
If it is good in the Firefox SafeMode, your problem is probably caused by an extension, and you need to figure out which one.
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes