As many users know, in 64-bit Windows 7+ users can use 64-bit Internet Explorer 11. It is dual mode browser, that is - it can run 32-bit tabs when needed, but it still may be source of problems, as it tries to run 64-bit Flash player plugin even when enhanced Protection Mode is disabled. It may be the cause of crashes reported in another topic.
Now we have 64-bit Firefox 37 beta ready for tests, so many requests for its support are more than obvious and 64-bit FDM plugins are a must.