Odd thing on Firefox

Firefox 51.0.1 (64-bit), Mac OS Sierra 10.12.3 (16D32). Not showing up on Chrome. Persists after restarting Firefox.

When I use J and K for post navigation, I get this weird artifact on the top of the currently selected post. I tried inspecting the element but the element disappears as soon as I go into the developer tools.

It’s not a big deal but it’s annoying.


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