Why do not the forward/back arrows work anymore - they are gray?

When I start a new window or tab arrows forward/reverse do not work and are grey. I can get the previous sites by right click. I also have a left tab of orange "Firefox" in the upper menu. It seems that I have a Firefox window on top a regular window.

Start Firefox in Firefox to solve the issues in Safe Mode to check if one of the extensions of the origin of the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > appearance/themes).

Tags: Firefox

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