STR: 1. Run Nightly on Linux. I'm running on Debian Stable with KDE. 2. Set the pref "layers.acceleration.force-enabled" to true. 3. Type characters into the search box and observe the popup window after each character. Also, erase characters and observe the popup window after each character. When typing or erasing a character causes the popup window to resize, most often it briefly flashes black before the resized contents are rendered. Bug 1280653 fixed part of this issue, where the black rendering sticks around until something else triggers another composite. However, it briefly flashing black is still a bug, albeit a less important one.
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