Occasionally when I open Firefox, it does not render anything until I close it and open it multiple times. This issue seems to be relatively random but occurs mostly if I close the browser for long enough. The browser seems to work even when not rendering since I still can see cursor changing as if it was pointing to a link when I move it around over the stuck window.

I'm on KDE Plasma 5.23.4 (Kubuntu) running an X11 session on Intel graphics.

Running in terminal, I get the following:
When Firefox doesn't render:

Code: Select all

ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.

When Firefox renders properly:

Code: Select all

ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.
[GFX1-]: Failed to create EGLContext!: 0x3001
ATTENTION: default value of option mesa_glthread overridden by environment.

Edit: I finally found the solution:
I should have mentioned that I have Nvidia graphics disabled, FF was trying to render using the disabled Nvidia card which led to this issue
According to this discussion:
https://www.reddit.com/r/pop_os/comments/rnergb/firefox_shows_blank_screen_after_upgrading_to_2110/

A simple solution is to add the following to your .profile:

Code: Select all

if ! grep -w -q nvidia <(lsmod) ; then
export __EGL_VENDOR_LIBRARY_FILENAMES="/usr/share/glvnd/egl_vendor.d/50_mesa.json"
fi

I can't reproduce this here, same distro and Plasma version.
What changes did you do to the default installation? Please also try with a second user, is this reproducible?

Mamarok wrote:I can't reproduce this here, same distro and Plasma version.
What changes did you do to the default installation? Please also try with a second user, is this reproducible?

I am running Intel graphics with Nvidia graphics set to be disabled. The issue happens occasionally with no obvious reason (Most likely when I don't use the browser for some time). Is it possible that I misconfigured something?

Mamarok wrote:What changes did you do to the default installation? Please also try with a second user, is this reproducible?

I tried with a second user, still the same issue.
I don't remember changing much the default installation, I just increased font size, setup some shortcuts and pinned a couple apps to taskbar + 1 widget, and set breeze as theme.
At this point I don't know what to blame: X11, KWin or Firefox.
Can I run Firefox in a way that it would output all the errors? This is getting really annoying, especially when I want to search something quickly and stumble with no graphics Firefox.

Simply typing

Code: Select all

firefox --help

yields quite a list of potential options, of which -g is probably the most logical one if you want to start in debug mode