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When viewing Twitter on my laptop a vertical scroll bar appears on the left hand side, but disappears if I hide the Menu Bar.

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A vertical scroll bar suddenly appeared on the left hand side of my screen when I view Twitter on my laptop. The scroll bar disappears if I hide the Menu Bar. How can I get rid of this scroll bar while having the Menu Bar visible?

Thanks in advance for any help.

A vertical scroll bar suddenly appeared on the left hand side of my screen when I view Twitter on my laptop. The scroll bar disappears if I hide the Menu Bar. How can I get rid of this scroll bar while having the Menu Bar visible? Thanks in advance for any help.
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Because your screen is not tall enough to display the entire sidebar menu, Firefox has to display a a scroll bar so that you can access items lower on the menu.

You can try possibly zooming out of the website a little bit so that the entire contents of the sidebar will fit on the height of your screen. See Font size and zoom - increase the size of web pages for more information on zooming in and out of pages in Firefox.

Hope this helps.