I noticed that a few people have suggested using the
TrackMeNot Firefox extension. Well here is another that I've recently started using that might be of use to some people.
RefControl
"Control what gets sent as the HTTP Referer on a per-site basis. You create a list of sites, and the referrer that should be sent for each site. You can choose to send that referrer unconditionally or only for third-party requests. Additionally, you can specify the default behavior for any site not in the list."
Basically it stop websites viewing what link you have licked in order to arrive at their page. What this means is that if you should accidentally click on an dam advert, the subsequent product's site will at least not know how you came to be on their page. This makes it really hard for advertisers to collect marketing data to establish how well their campaign(s) are doing.
You can check to make sure that your reffer header is empty by going here for a Anontest test -
https://www.jondos.de/en/anontest