Plugin does not install, offers to download, instead

Hi all

I'm using IceWeasel 31.4.0 on Debian.

I've installed pipelight-multi and performed these as root:

=8<==============
root@host:~# pipelight-plugin --update
--2015-02-17 22:44:28-- https://bitbucket.org/mmueller2012/pipelight/raw/master/share/install-dependency-1434FC73.sig
p11-kit: invalid config filename, will be ignored in the future: /etc/pkcs11/modules/gnome-keyring-module
Resolviendo bitbucket.org (bitbucket.org)... 131.103.20.167, 131.103.20.168
Conectando con bitbucket.org (bitbucket.org)[131.103.20.167]:443... conectado.
Petición HTTP enviada, esperando respuesta... 200 OK
Longitud: 28862 (28K) [text/plain]
Grabando a: “/tmp/tmp.dSKWeDiB3c”

100%[===================================================================================================================================================================================================>] 28.862 --.-K/s en 0,001s

2015-02-17 22:44:30 (22,4 MB/s) - “/tmp/tmp.dSKWeDiB3c” guardado [28862/28862]

gpg: Firmado el jue 05 feb 2015 12:39:12 WET usando clave RSA ID 1434FC73
gpg: /root/.gnupg/trustdb.gpg: se ha creado base de datos de confianza
gpg: Firma correcta de "Pipelight Dev Team (install-dependency) <email address hidden>"
gpg: ATENCIÓN: ¡Esta clave no está certificada por una firma de confianza!
gpg: No hay indicios de que la firma pertenezca al propietario.
Huellas dactilares de la clave primaria: CF23 08D4 3507 9A77 124E 01A2 83C7 3FB2 1434 FC73

Script dependency-installer has been updated to version 36678d7c8c9a90b37e8af5c305e8119afb9a379734a91065bc902ab138aa5e3b
root@host:~# pipelight-plugin --create-mozilla-plugins
root@host:~# pipelight-plugin --enable unity3d
Plugin unity3d is now enabled
=8<==============

But when I go to the Tropical Paradise page, it offers me to download the plugin as a UnityWebPlayer.exe file

What should I do with it?

Thanks