"Multiple threats secured" on Safari

Hello, I just dnld the free avast version and although the scan on my macbook doesn’t find any malware (I don’t have the full version of the program), everytime i open safari I get these messages (see attached screen shots). Should I worry? Is this sth I can delete? If yes, how?
Thank you in advance for your time and your help!
Evi

You are likely to get a better response in the Avast Mac Security sub forum.

Thank you!

You’re welcome, hopefully you will get a prompt response there.