how to stop ads from popping up?

[Dunbar Pappy ÏŸÏŸ]

For starters, block 3rd party cookies;
â–ºFIREFOX: Tools> Options> Privacy> top slot, drop menu, tick "Firefox will use custom settings..."> Check 'Accept Cookies from sites'
& Un-Check 'Accept 3rd Party cookies'

IE does not have exceptional "3rd party" blocking. For that reason, and many other security related ones (especially 'active scripting' rubbish), it should not be used except for sub-standard websites or Windows updates...but if you must know:
INTERNET EXPLORER: Tools> Internet Options> Privacy> Advanced:
here check 'Override automatic....'; 'Allow session cookies'; 'Allow 1st party cookies' & 'Block 3rd Party Cookies'.

Much more can be done but this is a starting point.