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Restore Firefox

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Without cause, Firefox disappeared and has been replace with Bing. As I try to reinstall Firefox, during the installation process there appears a screen saying "Tab Crashed." This ends the installation process. How do I get around this problem?

Without cause, Firefox disappeared and has been replace with Bing. As I try to reinstall Firefox, during the installation process there appears a screen saying "Tab Crashed." This ends the installation process. How do I get around this problem?

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