Weird unknown window

I have this weird window that mysteriously appeared after restarting firefox. I have been unable to identify what it is, where it comes from or any other information about it.

I was wondering if anyone else has had a similar problem and how I can go about debugging it.

Found the answer to this question.

The window is the gfxsanity.html chrome window that is used for the tests of mental health of gfx. Apparently this gets incorrectly rendered visible on occasion.

See https://bugzilla.mozilla.org/show_bug.cgi?id=1268065 marked as solved in 48, but I 49.0.2.

At least I know that there is nothing to worry about now.

Tags: Firefox

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