Please run ps aux | grep -i $X | wc -l where $X is the name of your web browser executable, i.e. firefox-esr. This should count the number of processes your web browser has spawned, plus one for the command you're running to check. Post in the comments below.
Tip: Never paste things into the terminal which you don't understand! But also if you don't know about ps, grep, or wc, they are very useful and you should look them up!
I don't know if this will grab an accurate number if it's running within a container ala Snap or Appimage. You may wish to inspect the output without wc to verify if you care.
This may work on MacOS???
I think I've got the high score on this one but I'm real curious what the averages are.
