Safari browser keeps opening random strange websites I don't want
Hello -- My MacBook Air is suddenly, irritatingly opening random websites unprompted in Safari. One is called "fizzsby.com" and appears to be filled with articles about trends and tabloid type news. The other is a fake Mac support page.
These websites open at random times while I'm using Safari. I've looked through my Safari extensions as well as my applications folder and can't find anything unrecognizable (malware/virus/etc) to delete or change to make it stop doing this.
I would love to make it permanently stop.
MacBook Air 13″, macOS 11.6