Firefox for mac won't quit

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You are redirected to the default browser extension store. To resolve this problem, click Fix Now in the Norton product main window. If you see Message: 'Browsing at Risk' displayed in the Norton product main window, the Norton Safe Web extension may not be installed or may be disabled in your default browser. It analyzes the security level of websites that you visit and shows if the websites are free from threats.

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Norton Safe Web protects you when you browse, search, or shop online using Google Chrome, Mozilla Firefox, Microsoft Edge and Apple Safari browsers.