okay here we have a little guide to stop those adverts running & eating into your useage allowance & slowing down pages loading.
Firstly click on 'tools' at the top left of your page, then click or hovver your mouse icon over the 'manage ad-ons' then click on enable/disable ad-ons.
A box should come up, find Shockwave Flash Object and click on it. Then click on 'disable' then click OK. This should stop ads running in the background for all your web pages.
Obviously some web pages need this to show what you want to see but you can just as easily enable it.
Shockwave is one of many things running in the background of your computer & not all of them are needed.
Hope this helps someone anyway.