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Firefox 133 says "Firefox is running but is not responding"

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This happens when I click a link in an email or elsewhere. Firefox responds otherwise, I can open links within Firefox. It used to simply open the link in a new tab.

How can the previous behaviour be restored? so I can open a link in an existing FF window?

This happens when I click a link in an email or elsewhere. Firefox responds otherwise, I can open links within Firefox. It used to simply open the link in a new tab. How can the previous behaviour be restored? so I can open a link in an existing FF window?

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