Firefox Scroll Bar Gone-Please help

[ChiSoxFan]

I use Firefox on all 4 of my computers and for some reason the scroll bar on my main pc is completely gone. I can still scroll up and down using my mouse, but can't click on the slider on the right side of the screen anymore because it just disappeared. This is probably a stupid thing I did by accident but has anyone had this problem or know how to solve it?

 

[igowerf]

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