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All of the "open new tab" operators have ceased to function. How do I reinstate them?

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All of the "buttons", "keystrokes", operations, etc. that "open a new tab" have ceased functioning. How do I reinstate them?

All of the "buttons", "keystrokes", operations, etc. that "open a new tab" have ceased functioning. How do I reinstate them?

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Uninstall the Ask Toolbar. It can cause that problem.


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Not related to your question, but...

You need to update some plug-ins: