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Posted on July 15th, 2013 at 9:28 AM EDT
The question, then, is what to do if you see this pop-up. If you cannot close the window or the browser, then you will need to force the browser to quit. Press command-option-esc to display the force quit window. In that window, make sure your web browser is selected, then click the Force Quit button. Once the browser quits, you can close the force quit window.
Depending on your browser and/or system settings, your browser may try to reload the pages that were open the last time it quit. This could cause the problem to recur immediately, as soon as you open your browser again. In Safari, you can avoid this by holding down the shift key while opening the app.
Once you have your browser open again, you should be fine. You could clear your cookies and browser cache if you like, but that really won’t be particularly useful. Contrary to popular belief, this will not cure such problems or prevent them from occurring.