I received an email from a Mac user saying that Adsense didn't show up on a certain site when he used either Firefox or an old version of IE as a browser. However, when he used Safari, the ads did show. Anyone any ideas why this might be??? If any Mac users who have firefox could check the site www.bigtravelweb.com and advise if ads appear it would be appreciated.
It is loading ... just had a check.. Screenshot attached. May be his firefox has got adblock plus installed
Post the link of the site and i will try it for you if you want, anyway it is probably as what perfectblue said.