Dear friends, this is not a Rapidweaver related issue, so I do apologize in advance.
For more than a week this annoying notice has appeared very frequently.
I would greatly appreciate any help.
I’ve had good luck cleaning infected macs with it. The free version may be enough to clean it. The paid version can provide protection from this happening in the future.
Thanks Don for your kind and prompt response,
I ran it and the problem disappeared for a few hours, but it is present again.
Looks like an extension which has been installed by Google Chrome? Try this: