i understaand it's for forefpx? i tried to download it or even read documentation about it but they won't let me without logging in and i don't have an account.
https://www.paypal.com/us/cgi-bin/webscr?cmd=xpt/cps/general/NewPayPalPlugin-outside
it's possible it might work but must test, can you download it the full plugin, sometimes they don't ley you don't the full thing and use an 'online installer' which connects and downloads the files into temp.
get the full plugin whether it's xpi or exe.. i think it's an xpi because the snapshot looks like firefox and they can't make icons in firefox without xul, after downloading it, upload it somewhere
you can use
http://datafilehost.com (it's better than the other sharerers because no countdown crap)