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Small horizontal scroll bar at the top center of the screen

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Two days ago a small scroll bar appeared at my top screen in every new tab I open, I researched a bit but with no success, do you know why it happened?

Thanks in advance.

Two days ago a small scroll bar appeared at my top screen in every new tab I open, I researched a bit but with no success, do you know why it happened? Thanks in advance.

All Replies (3)

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Hello! You can send us a print (image) so we can review your case?

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I attached one in the thread creation, anyway I attach other

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This is a Firefox inappropriate behavior. See the possible solutions:

> Restore Firefox: https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings

> Create a new profile: https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles