Do Not Track lets advertising networks, websites and apps know they wont be able to serve ads to you based on your digital behaviour. Duck Duck Go is an alternate search engine that takes your privacy seriously. A Private Browsing window lets you open up a private browsing window to make transactions, browse for a birthday present or even do online banking. To keep the snoops and spies at bay, however, you should consider using a VPN service when youre using WiFi. You can agree to submit your data back to Mozilla to study changes in behavioural targeting.”]
Source: https://informationsecuritybuzz.com/articles/invisible/