User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0
Steps to reproduce:
open web page
wait for loading finished
scroll down to check the content
All items should be displayed correctly.
The Bugbug bot thinks this bug should belong to the 'Core::Graphics: WebRender' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.
I couldn't reproduce this in neither nightly nor nightly 78 (via mozregression). The only bug I see is that if you shrink the window enough then you get everything on a single row, and they disable the scrollbar on Firefox via scrollbar-width: none;, so you can't scroll, which seems unfortunate but seems like a bug in the page.
When the issue happens, I can still scroll both up and down as you can see the scroll bar. The window is already in full screen as you can see from the screenshot.