What did you do? ================ 1. Open a page 2. Open another window (hardware accelerated WPF) that overlap Firefox window 3. Minimize that window and see rendering artifacts. What happened? ============== The page was rendered with artifacts (black areas) What should have happened? ========================== The page had to be rendered normally Is there anything else we should know? ====================================== I'm on the alpha channel but I experience this bug several versions already. I have a switchable graphics (Nvidia and Intel). I have a screenshots. OS is Windows 10 Pro
Created attachment 8760671 [details] firefox bug.png The areas in red is my edits (removed personal info)
Component: General → Graphics
Product: Mozilla Developer Network → Core
Thank you for the report. Does this still occur if you disable acceleration in firefox? Although you have experienced this for a few releases, as it may still be a regression would you be able to run mozregression to find the regression range? https://mozilla.github.io/mozregression/
Whiteboard: [specification][type:bug] → [specification][type:bug][gfx-noted]
I too experience this on two separate computers (one with switchable graphics, one without). Disabling hardware acceleration does not seem to fix the problem for me. Things of note: - It can go for long periods without occuring - When it does occur, it is often on a page load - Mouse movement, page scrolling, tab switching, etc can make it appear/disappear Windows 10 x64 GTX 980Ti (Computer 1) and GTX 960M + HD530 (Computer 2)
Created attachment 8767449 [details] rendering bug firefox Another example image of the bug occurring.
The bug doesn't reproduce after I have switched off hardware acceleration.
Priority: -- → P3
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