I had strange issue with Safari on Macbook today. It add on any pages I had visited links to other sites. It looks like an advertising.
For example, if I had the page with next text:
".... answers for you Apple question ..."
Safari changed page so "Apple" was hyperlink to other site with an advertising of Apple production. I can see it on any page and with different words.
I have not install any Safari extensions last time and the only thing that looks suspicious is the new Apple update which I have installed today.
I have restarted Safari and now all looks fine, but I just want to know what it had been and what I can do now to find the reason this strange behavior and to dispose future risk to security.