This seems to go away after the next Nightly update, until it happens again when I restart Nightly frequently with the toolbox open.
Bug 1586741 Comment 3 Edit History
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~~This seems to go away after the next Nightly update, until it happens again when I restart Nightly frequently with the toolbox open.~~ Scratch that, I just updated Nightly and this persisted afterwards. Still unsure about the excat STR.
~~This seems to go away after the next Nightly update, until it happens again when I restart Nightly frequently with the toolbox open.~~ Scratch that, I just updated Nightly and this persisted afterwards. Still unsure about the exact STR.