To make it clear, this also happens outside of safe mode. I was just trying to make sure I had no add-on interference. I have also tried a fresh profile and still am able to reproduce this. CPU and GPU usage were at acceptable values, both below 60% when trying to reproduce this.
Bug 1730435 Comment 1 Edit History
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To make it clear, this also happens outside of safe mode. I was just trying to make sure I had no add-on interference. I have also tried a fresh profile and still am able to reproduce this.