Firefox doesn't appear in the processes list, even though it's running normally. It's that normal?

I'm using Ubuntu 20.04 LTS. Firefox is the only browser installed here, so it's the only one I use. The processes list doesn't contain a firefox process (both the system monitor and terminal). It's that normal or it's a signal there is something wrong with the system?

With help of @mivk.

The command below shows the firefox processes in the terminal:

ps ax | grep -i firefox. The processes appear as /usr/lib/firefox/firefox in Ubuntu 20.04.3 LTS.

And this shows the processes in the System Monitor:

In System Monitor, it will show as "Web Content" and others under the "Process Name" column. You have to enable the "Command Line" column to see "firefox".