thanks. Decided to turn on and allow ‘studies’ overnight to allow fix to be pushed down overnight…could see it listed as Active before heading to bed…will check shortly if completed then turn of the Studies option
FFox seemed to do update as I see the Hotfix in about:addons -> Extensions and it shows ‘Active’ in about:studies when I look in Add-Ons Manager…BUT! when I look at about:addons -> Unsupported, mine are all still there and still disabled same as yesterdays image post… 
And yet seeing white space where Ads would have been on many sites so maybe all’s well after alll…very confusing!
I moved up to a later FFox ESR release overnight and that looks to have helped with just the HP Smart Web Printservices now disabled… not used so no issue 
