Firefox browser disables google adsense? Please help.

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I have struggled a lot to design a website about family medical and health advises including a forum. I downloaded phpbb software, and experimented a lot with it. Finally, on 12th April, I have launched my forum and website. Forum is able to attract some viewers, on their own. Now, I have tried to integrate google adsense account into the forum pages. And, I tested it on internet explorer 8 and google chrome (4.1. .. ).. both browsers responded well to my design. But, I am shocked when one of my members, off shoot, told me that there are no ads. I searched my code, but did not find the solution. Could some one tell me, if google adsense is disabled automatically by the firefox browser? Thanks in advance for the help.