Step one: go to https://www.openmultipleurl.com/
This can be done in chrome OR internet explorer. I’ve personally had more success with Internet explorer.
Step 2: copy your typo-squatted domains into the textbox.
Here are some that typically work for me-
www.gmil.com
www.ggmail.com
www.youutube.com
www.youtibe.com
Make sure each domain is on it's own line!
Step 3: click the big green "GO NOW" button. This'll open all your domains in new tabs. Look for any tabs that are flashing or that say something like "Microsoft Support".
NOTE: You will not always get scam popups as it's not 100% guaranteed. Sometimes popups campaigns just aren't running for people with your location, computer type, etc.