There was a link in the comments section of a question (don't click the link) https://en.wikipedia.org/wiki/Banach%E2%80%93Tarski_paradox was supposed to redirect you to Wikipedia. It indeed happened but right after clicking the link a window notification of Avast pop up saying that 26 cookies were set up in your system.
I have never seen such message notification for visiting Wikipedia. And seems strange since I do check lots of 'reliable' links and nothing like this happens.
At first I thought it has something to do with Wikipedia cookies so I checked the cookies but there were only 11 cookies, so what about the rest of the cookies?
Also, I recently cleared my computer where all cookies were reset, not sure if it has something to do with it.