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Inprivate browsing does not start/ cannot be accessed through tools menu

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When prompt to start firefox in Private browsing nothing happens. When a window is open normally, Private browsing cannot be started.

When prompt to start firefox in Private browsing nothing happens. When a window is open normally, Private browsing cannot be started.

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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).