User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0 Build ID: 20180526100113 Steps to reproduce: Sometimes when I open Nightly or restart due to an update the window is not drawn correctly as how in the picture attached. If I resize the window it works if I switch tabs it doesn't. I need to resize the window to fix this problem. Firefox for some reason doesn't recognize or remember the screen size correctly. I'm using Ubuntu 18 (Gnome) and Nightly 62.0a1. Expected results: It should draw correctly.

This can be related to Ubuntu or my hardware, I'm not able to reproduce on openSUSE in a similar laptop. glxinfo output: name of display: :0 display: :0 screen: 0 direct rendering: Yes Extended renderer info (GLX_MESA_query_renderer): Vendor: Intel Open Source Technology Center (0x8086) Device: Mesa DRI Intel(R) UHD Graphics 620 (Kabylake GT2) (0x5917) Version: 18.0.0 Accelerated: yes Video memory: 3072MB Unified memory: yes Preferred profile: core (0x1) Max core profile version: 4.5 Max compat profile version: 3.0 Max GLES1 profile version: 1.1 Max GLES[23] profile version: 3.2 OpenGL vendor string: Intel Open Source Technology Center OpenGL renderer string: Mesa DRI Intel(R) UHD Graphics 620 (Kabylake GT2) OpenGL core profile version string: 4.5 (Core Profile) Mesa 18.0.0-rc5 OpenGL core profile shading language version string: 4.50 OpenGL core profile context flags: (none) OpenGL core profile profile mask: core profile OpenGL version string: 3.0 Mesa 18.0.0-rc5 OpenGL shading language version string: 1.30 OpenGL context flags: (none) OpenGL ES profile version string: OpenGL ES 3.2 Mesa 18.0.0-rc5 OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20