Thanks John will look into those for sure, although I already have other block settings.
Edited Just went and checked privacy settings in Firefox and "All ways Use Private Browesing" had been changed to off.
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Don't put too much faith in the "Do Not Track" option in browsers. Advertisers interpret it slightly differently than you think.
To me "Do Not Track" means "Advertisers, please don't collect or store any information relating to me without my specific permission".
To Advertisers, it means "Don't serve me targeted ads based on my browsing, but please continue to collect, store, analyse and monetise information about me".
Why Do Not Track is worse than a miserable failure | ZDNet
I think I'll continue to use Adblock and Ghostery....