How can I remove side adds in classifieds

[Bebee]

My system is slow enough without these distracting adds that move with my scrolling.

I use firefox I installed add block ages ago with sucsess but these new side adds seem to get through.

[Bebee]

Cheers for update Pete

[Bebee]

I fking hate with a vengeance that header advert that forces my page up, then down, when trying to view something of interest in the classifieds, it also forces me to click something I don't want, or opens other page up because I accidentally click it when the fking page is going up and down like a bd yo yo.
So frustrating!!!