Pay Per Click Browser Version Targeting

I only want to target Firefox users...is this possible?

[VinTurk]

We are releasing a Firefox addon (unfortunately no IE version yet) and would like to advertise to Firefox users.

Does anyone know of banner networks, ppc engines, or basically any other advertising providers out there that have this capability?

Does AdWords allow you to do this?

Thanks in advance...
-=Vince

[encyclo]

Assuming you are using some server-side technology (PHP, ASP etc.) then you can check the User Agent of the visitor and only include the adblock if the UA contains the string "firefox".

If you don't use scripting, you can check the UA with Javascript, however this may entail modifying any supplied Javascript code for inserting the ads, so you would need to check with the advertising company's terms of service first.