I get a missing plugin in Firefox

openSUSE 12.3
KDE 4.10.5r1
Firefox 23

It is from a secure site that has my wife's pay check stub and I don't think I have an option to download it.

I had to go to a Windows machine in order to print it,

How can I see what plugin it is looking for ?

When I was in Windows, I looked at the properties of the document and it might be Java script, but then again I have no clue what I am looking at.

I am doing my best to abandon Windoze so please help.

thanks