Blank/empty window

[grahamperrin]

What might cause the cookie management window to be empty?

For example (the screen to the left):

At first, I imagined an extensions conflict because I can't reproduce the issue with a different profile (the screen to the right). I ploughed through my enabled extensions, disabling a handful at a time, no improvement. Then disabled everything except Cookie Quick Manager, still no improvement.

[grahamperrin]

Ah, a workaround:

☑ Always open Cookie Quick Manager in new tab

---

I wondered whether my userChrome.css (for Vertical Tabs Reloaded) is a problem:

grahamperrin@momh167-gjp4-8570p:~/.mozilla/firefox/58ectoj2.default/chrome % cat userChrome.css 
#TabsToolbar {
    visibility: collapse;
}

*{ transition-duration: 50ms !important }
grahamperrin@momh167-gjp4-8570p:~/.mozilla/firefox/58ectoj2.default/chrome % 

– but the issue is reproducible when I run the affected profile without it.

[ysard]

Hi, thank you for looking for a reproducible origin to the problem.

I am currently testing on Firefox 68.0b10 and I do not have this problem;
Addons:

• CQM (opened in a new window each time)
• VTR

However, it looks like an old bug. When you try to resize the white/blank window with the mouse, does its content appear?

[ysard]

Tested on 67.0.2, still nothing :(