I have a fake vertical gray bar (about 4cm wide) between the trees tabs and firefox page style. How can I get rid of him?

I created a new computer yesterday that runs windows 8.

I downloaded Firefox, then added tree style tabs and colourful tabs after which I powered off for the night. Today on rebooting and opening up Firefox I find that I have a vertical grey bar between my tabs (and same width as them) and the Firefox page. There is no right click options within that large grey area - and of course it's pushing my pages off the right hand side of the screen. How do I get rid of this blasted thing??????
Pete

I had this problem, but it was because I had two tree Style tabs and Vertical both installed. Once I removed the vertical tabs, the gray bar went away.

Tags: Firefox

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