I installed a VPN yesterday. I turned the VPN on and opened my browser (Firefox) and everything seemed fine, the VPN IP address was displayed in the upper right corner on the browser, however, I also noticed that when I used Google, it was displaying advertisements for products I was looking at on Amazon a few days back, before I had the VPN. How is this possible if my IP is routed through the VPN server and supposedly disguised? Are websites able to read cookies installed on your computer, even after you install and use a VPN? Any help would be appreciated.