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I'm in a Sagemath 7.4 notebook. I click Help and choose a topic. It claims it is opening in a new "tab." Then I am stuck in help (presumably a Chromium tab) until I reboot the VirtualBox VM! If I had a keyboard shortcut to switch tabs or close the current tab, I think I'd be in business. As it stands, I'm stuck outside Sage until I reset the VM.