Yes, currently Bonfire already supports IE9 for 64-bit systems, and you can verify all the information about Bonfire's compatibilities in the link below:
Just a quick heads up regarding to IE10, there isn't a date set for the Atlassian Products to start supporting it in the documentation.
The bonfire App installs fine on the 32-bit version of IE9, but I don't get the add-on's for the 64-bit IE9.
Is this a seperate installer?
(i'm not talking about the system itself, i'm talking about Internet Explorer 64-bit vs. Internet Exploerer 32-bit versions that are available on 64-bit systems.)
Yes, there are separate installers for each platform:
The direct links to installers:
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