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Inexplicable black line appearing over my tab?

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My firefox updated to the (horrible) new tabs, and now there's an incredibly annoying black line that appears over my Facebook tab that I can't find any way to get rid of. What does this mean? What is it for? How do I kill this stupid thing? With the (terrible) way the new tabs distinguish between the active tab and the inactive tabs (basically just a slightly different, nearly indistinguishable shade of off-white), this black bar is the most striking visual element on my row of tabs, so it grabs the eye the way the active tab should, and it's confusing and distracting.

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Do you have the Facebook Container addon?

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Chosen Solution

Do you have the Facebook Container addon?

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A number of users have said that the container color line moving from the bottom of the tab to the top of the tab is more distracting. I'm not aware of a built-in way to modify the position, shape, or length of this line, but possibly custom style rules in a userChrome.css file (a community-supported workaround) might help. There's an active subreddit for hacking Firefox's interface with style rules here where you might find more guidance:

https://www.reddit.com/r/FirefoxCSS/

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Thanks guys, that's fixed me, apparently it was the Facebook Container addon that was adding that annoying line.