User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:42.0) Gecko/20100101 Firefox/42.0 Build ID: 20150928102225 Steps to reproduce: Go to some page, minimaze Firefox, go back after some time. Actual results: Elements of top panel are not visible and became visible after hovering it by cursor. Expected results: All elements should be visible.

Please type about:support into the location bar, then press Enter. Copy the entire Graphics section to the clipboard, then paste it in a comment here. Can you reproduce the issue after toggling the status of hardware acceleration and restarting Firefox? https://support.mozilla.org/kb/advanced-panel-settings-in-firefox Can you reproduce the issue in the latest Nightly in a brand new profile? https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles https://nightly.mozilla.org

Grafika Asynchroniczne przewijanie/powiększanie brak Data sterownika 7-17-2015 Data sterownika (GPU #2) 9-13-2015 GPU #2 Active false ID dostawcy 0x8086 ID dostawcy (GPU #2) 0x10de ID subsystemu 229c103c ID subsystemu (GPU #2) 229c103c ID urządzenia 0x1616 ID urządzenia (GPU #2) 0x1391 Okna ze sprzętowym przyspieszeniem grafiki 1/1 Direct3D 11 (OMTC) Opis adaptera Intel(R) HD Graphics 5500 Opis adaptera (GPU #2) NVIDIA GeForce GTX 850M RAM adaptera Unknown RAM adaptera (GPU #2) 4095 Renderer WebGL Google Inc. -- ANGLE (Intel(R) HD Graphics 5500 Direct3D11 vs_5_0 ps_5_0) Sprzętowe dekodowanie H264 true Sterowniki adaptera igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32 Sterowniki adaptera (GPU #2) nvd3dumx,nvwgf2umx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um,nvwgf2um Wersja sterownika 10.18.15.4256 Wersja sterownika (GPU #2) 10.18.13.5598 windowLayerManagerRemote true Włączone Direct2D true Włączone DirectWrite true (10.0.10240.16430) AzureCanvasBackend direct2d 1.1 AzureContentBackend direct2d 1.1 AzureFallbackCanvasBackend cairo AzureSkiaAccelerated 0

When I disabled HWA, I couldn't reproduce the issue, but I'm not sure, because with HWA enabled I don't reproduce issue every time.

It seems that in Firefox nightly problem is not present.

Unfortunately, problem didn't disappear. Today two times some time after minimizing Nightly whole top panel wasn't visible.

Nothing left for me to do here. A developer needs to have a look at this. Clearing needinfo flag.

Milan, any ideas how to move this forward?

I would like to stress out that last two times whole top panel wasn't visible, even adress bar, titles of tabs and "Minimize", "Maximize", "Exit".

Recently I have installed Thunderbird Beta and the same bug I have noticed there.

An example from Thunderbird. As you can see, Nightly and Thunderbird Beta have this bug in common.

to_du, are you still able to reproduce this with the current Firefox/Thunderbird nightlies?

Unfortunately, not. When I hover elements with mouse, they become visible. Resizing makes everything visible.

Of course, unfortunately, I'm still able to reproduce.

to_du@o2.pl, is the problem still happen on nightly that has Bug 1237617 fix?

This happens on latest Nightly. It's for sure the same type of the problem like bug 1237617, but you must minimize Nightly and go back after some time.

(In reply to to_du from comment #16) > This happens on latest Nightly. It's for sure the same type of the problem > like bug 1237617, but you must minimize Nightly and go back after some time. Thanks. Since it's been some time can you please confirm you are on the latest graphics driver for your graphics cards (assuming you are still running dual GPU).

Yes, I have the latest graphics drivers.

Just a heads-up: I've seen this bug before, though not in a while. I also have an Intel HD 5500 (& no secondary GPU).