Why does firefox display these lines?

loydchase

New member
Nov 17, 2018
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Firefox is displaying these 3 lines around/on some nav bars that i have. they dont display in other browsers.... if you can figure out a way to change the css to git ridd of these that would be preferred(im using FF specific code in css so that wont effect other browsers)

The bars seem to come from the background of the bars.