User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0

Steps to reproduce:

Visited reddit , duolingo and a few other pages.

Actual results:

Some elements (mostly top right) were invisible.

See imgur album or the attached file

Expected results:

Visible elements.

When seeing the problem, please open about:support, click on "Copy text to clipboard", paste it into a text file and upload it here (Attach File). Thanks!

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.2 LTS
Release:        18.04
Codename:       bionic

$ neofetch 
            .-/+oossssoo+/-.               ubuntu@loneliverse 
        `:+ssssssssssssssssss+:`           ------------------ 
      -+ssssssssssssssssssyyssss+-         OS: Ubuntu 18.04.2 LTS x86_64 
    .ossssssssssssssssssdMMMNysssso.       Host: P15SM 
   /ssssssssssshdmmNNmmyNMMMMhssssss/      Kernel: 4.15.0-51-generic 
  +ssssssssshmydMMMMMMMNddddyssssssss+     Uptime: 10 hours, 50 mins 
 /sssssssshNMMMyhhyyyyhmNMMMNhssssssss/    Packages: 5719 
.ssssssssdMMMNhsssssssssshNMMMdssssssss.   Shell: bash 4.4.19 
+sssshhhyNMMNyssssssssssssyNMMMysssssss+   Resolution: 1920x1080, 1360x768 
ossyNMMMNyMMhsssssssssssssshmmmhssssssso   DE: KDE 
ossyNMMMNyMMhsssssssssssssshmmmhssssssso   WM: KWin 
+sssshhhyNMMNyssssssssssssyNMMMysssssss+   Theme: Breeze Dark [KDE], ThinIce [GTK2], Breeze [GTK3] 
.ssssssssdMMMNhsssssssssshNMMMdssssssss.   Icons: Oxygen [KDE], Unity-webapps [GTK2/3] 
 /sssssssshNMMMyhhyyyyhdNMMMNhssssssss/    Terminal: konsole 
  +sssssssssdmydMMMMMMMMddddyssssssss+     CPU: Intel i7-4700MQ (8) @ 3.400GHz 
   /ssssssssssshdmNNNNmyNMMMMhssssss/      GPU: AMD Radeon HD 8970M 
    .ossssssssssssssssssdMMMNysssso.       GPU: Intel Haswell Mobile 
      -+sssssssssssssssssyyyssss+-         Memory: 8738MiB / 15961MiB 
        `:+ssssssssssssssssss+:` 
            .-/+oossssoo+/-.                                       

Thanks! Would this problem no longer occur if you open about:config, set gfx.webrender.force-disabled to true and restart Nightly?

I just tried that, to no avail.

The issue isn't present in Firefox 67.0.2 (64-bits)

Could you try to find a regression range?
https://mozilla.github.io/mozregression/install.html
sudo apt-get install python-pip
pip install -U mozregression
mozregression --good 2019-03-18 --bad 2019-06-18

Do you have any zoom applied? This sounds like bug 1559518 and dupes.

Hi.

Saw the message a bit late. Here are the last few lines:

8:31.99 INFO: Narrowed inbound regression window from [6baa1883, 94b369f3] (3 builds) to [a91efd69, 94b369f3] (2 builds) (~1 steps left)
 8:31.99 INFO: No more inbound revisions, bisection finished.
 8:31.99 INFO: Last good revision: a91efd693851d156f5680c88e6f91d12406ec3fe
 8:31.99 INFO: First bad revision: 94b369f38c536a4cc3b308311b1e88825e581ff5
 8:31.99 INFO: Pushlog:
https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=a91efd693851d156f5680c88e6f91d12406ec3fe&tochange=94b369f38c536a4cc3b308311b1e88825e581ff5

It happens with my profile and not with an empty one, so I don't know what causes it.

Happy to provide more information :)

Thanks!

Do you still see this issue in the latest nightly? Bug 1559518 landed some fixes here.

Hi,

I just checked and it's fixed in 69.0a1 (2019-06-21) (64-bit) 👍

Thanks!