Internet Explorer users are at least four times as likely to click on Web ads than Firefox users, according to, Adtech AG, a German research company. They found that during October and November only 0.11 percent of Firefox users ever clicked on an ad, compared to around 0.5 percent of IE users.
According to an article on ZdNet the reason for this trend is probably the different surfing habits of Firefox and IE users. These findings could have significant implications for the online advertising market since the number of Firefox users is growing, and web sites might face a(nother) decline in click-through rates.