O Flash não funciona em 64 bits também. Acho que temos que nos resignarmos a um mundo do navegador por um bom tempo ...
So why haven't Mozilla and Google bothered to release official 64-bit browsers? For the same reason Microsoft hasn't bothered to produce a 64-bit version of its Silverlight plugin: nobody uses 64-bit browsers.
That might sound like a vicious circle, and it is; if you are using a 64-bit browser, you need to use 64-bit versions of all your plugins, and plugin makers aren't particularly eager to make 64-bit versions until 64-bit browsers start being used with some frequency. There are three key plugins that need to offer 64-bit versions before mainstream users can switch. In order of least important to most important, these are: Silverlight, Java, and Flash.