same plugin(ATL COM DLL) should work in Mozilla ( rite now it is working in IExplorer )

Question

I have a ATL COM DLL that work as plugin for IExplorer. Which basically enhance the download functionality of IExplorer.When we click to download a file its pop up my dialog instead of default IExplorer.

I want that same dll will work for Firefox Mozilla. What I have to do for it.

I found on net that it is possible, but did not get any code or propper document to do this.

It has following registry entry to expose functionality in IExplorer. HKLM
{
Software
{
Microsoft
{
'Internet Explorer'
{
val DownloadUI = s '{9C303C2B-8B38-4DAD-B176-1747FEB836C0}'
}
}
}
}