When editing post, creating post or searching Discourse.
When the keyboard opens.
The whole screen goes blank.
On all Discourse forums I tried.
Is it the same for you?
Android 9 Firefox 142 (brand new)
I have made an MP4 screen capture:
Did this start happening when you updated to firefox v142? Does it happen in other browsers?
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I think this blank screen bug is since and only with Firefox 142, as I see in my phone that it was updated 2 days ago.
And I tried Chrome browser with no blank screen bug.
I managed to upload the video, you can see that a small blank bar appears at the top of the screen.
And the bottom address bar goes up to the top, each time the keyboard appears.
Until I force close Firefox.
It seems to be what’s causing the blank screen bug on edit.
More a Firefox bug than a Discourse bug, but I don’t know how to report bugs to Mozilla.
PS. I removed my off-topic MP4 upload bug, I found the reason and work-around.
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Popping up the keyboard in Discourse triggers the top horizontal padding blank bar and bottom menu bar slide up, covering the whole screen.
The top horizontal padding blank bar remains even when quitting Discourse.
You can see this behaviour in this video:
Only when I kill Firefox app that it disappears.
I will post here if I find another site than Discourse that triggers this Firefox for Android 142 bug.
If someone knows how to report them the bug, I didn’t find. 
yeah pretty sure it’s a new Firefox bug.
You can report those here https://bugzilla.mozilla.org/home
(you do need an account though)
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Thanks very much for the link, @chapoi!
Workaround: make the keyboard float.
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Cannot reproduce this issue with the same version of Firefox on an android 15 tablet.
I’m going to try to reproduce this in an android 9 emulator with a phone-styled viewport. The performance was terrible for some reason, probably my tablet’s 4gb of ram, but i will try again
I tried android 9 with virtual master now, here are the results:
Basically what the author said, but on my emulator window, the white does not go all the way to the top.
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The white’s height equals the keyboard’s height.
So, the bigger the keyboard is, the bigger the white will be.
Thank you for reproducing!
So, it’s only in Android 9 Firefox 142…?
The Android 9 emulator didn’t reproduce the permanent top horizontal bar part of the bug.