[Bug] Large black rectangles and screen flickering #19360
Description
Steps to reproduce
Open any website.
Expected behavior
Full webpage is drawn correctly.
Actual behavior
Large portions of the screen (mostly large rectangle at the top and bottom of the viewport) are just black rectangles. During scroll, the rectangles flicker in color, but the content that should be rendered on those rectangles is never drawn. (That is, I can see some content in between the black rectangles, and if I scroll past a black rectangle, I can see more content followed by another black rectangle. But I can never scroll in such a way that I can see the blacked-out content.)
Tapping the screen seems to still work; I can long press and get links and contextual information. So it seems that it's just drawing the screen is having an issue.
This is similar to #19348 and #19342, but the rectangles are much larger on my screen, always flicker and appear on every website I visit. Also, those two issues reference Mali GPUs, but this is a Qualcomm GPU.
This began happening on my device some time last week.
Device information
- Device vendor / model and Android version: Moto g6 Play (XT1922-9, hardware version P4), Android version 9
- Firefox for Android version: ? 90.0a1 (Build #2015808079)
┆Issue is synchronized with this Jira Task