User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0 Build ID: 20170728100358 Steps to reproduce: 1. In Windows, open the Device Manager 2. Disable and re-enable the video driver. Note: I am using a 4K screen and 200% DPI. While the video driver is disabled, the display changes to a lower resolution and 100% DPI. Actual results: Firefox becomes extremely sluggish. Scrolling is very slow; videos will not render (just show a black screen); some things are slow to load and render. Restarting the browser fixes the problem immediately.
OS: Unspecified → Windows 10
Hardware: Unspecified → x86_64
status-firefox57: --- → fix-optional
Priority: -- → P3
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