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Private Browsing function is suddenly not working. Error message :"The URL is not valid and cannot be loaded." How can I repair?

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ennqual
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Private Browsing function is suddenly not working. Error message :"The URL is not valid and cannot be loaded." How can I fix it?

Private Browsing function is suddenly not working. Error message :"The URL is not valid and cannot be loaded." How can I fix it?

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cor-el
cor-el
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).