Stop Online Advertising Support Pop-up Webpage - Remove Rvzr-a.akamaihd.net Redirect

Within the last 2 days I have noticed some kind of adware when I use Firefox. It causes adverts to appear on screen - when I try to close the adverts, they force me to visit a website called 'Online Advertising Support'. I've also noticed that some web-pages I view are made unstable, bringing up messages such as: "a script on this page may be busy, or it may have stopped responding. You can stop the script now, open the script in the debugger, or let the script continue. Script: http://pstatic.eshopcomp.com/nwp/Extern ... cy_v2.js:1 "....hope you may be able to advise. Thankyou for your assistance. 

Information of Online Advertising Support