Hmm, I wonder why the lower left corner has a YouTube video URL? Is the page loading that as part of the results?

When this happens, is Firefox still showing a Stop (X) button on the toolbar, or is Reload (circling arrow) available? If Reload is available, does it work?

I never noticed the URL, I'm not sure why it shows a YouTube URL. The toolbar has a reload button not the X to stop loading then when reloading the page it does work.

It's hard to know why Firefox stalled loading the page. Is there any pattern related to the layout of problem results page?

Not really, it happens randomly and the page sometimes loads and sometimes doesn't. It will only load a white page with no error or anything similar. I've only found it happens when I use the search bar at the top within Firefox.

Sorry, I meant if you get the blank page and reload, do you notice any pattern after reloading? For example, shopping carousel or Apple Maps at the top, or something else other than the usual.

When I reaload the page then displays normally, I don't notice anything different.