<s>
Mozilla	B-Language
Prism	I-Language
(	O
formerly	O
WebRunner	O
)	O
is	O
a	O
discontinued	O
project	O
which	O
integrated	O
web	B-Application
applications	I-Application
with	O
the	O
desktop	O
,	O
allowing	O
web	B-Application
applications	I-Application
to	O
be	O
launched	O
from	O
the	O
desktop	O
and	O
configured	O
independently	O
of	O
the	O
default	O
web	B-Application
browser	I-Application
.	O
</s>
<s>
As	O
of	O
November	O
2010	O
,	O
Prism	B-Language
is	O
listed	O
as	O
an	O
inactive	O
project	O
at	O
the	O
Mozilla	B-Operating_System
labs	I-Operating_System
website	O
.	O
</s>
<s>
Prism	B-Language
is	O
based	O
on	O
a	O
concept	O
called	O
a	O
site-specific	B-Protocol
browser	I-Protocol
(	O
SSB	O
)	O
.	O
</s>
<s>
An	O
SSB	O
is	O
designed	O
to	O
work	O
exclusively	O
with	O
one	O
web	B-Application
application	I-Application
.	O
</s>
<s>
It	O
does	O
n't	O
have	O
the	O
menus	O
,	O
toolbars	O
and	O
other	O
accoutrements	O
of	O
a	O
traditional	O
web	B-Application
browser	I-Application
.	O
</s>
<s>
The	O
software	O
is	O
built	O
upon	O
XULRunner	B-Language
,	O
so	O
it	O
is	O
possible	O
to	O
get	O
some	O
Mozilla	B-Application
Firefox	I-Application
extensions	O
to	O
work	O
in	O
it	O
.	O
</s>
<s>
The	O
preview	O
announcement	O
of	O
Prism	B-Language
was	O
made	O
in	O
October	O
2007	O
.	O
</s>
<s>
On	O
February	O
1	O
,	O
2011	O
,	O
Mozilla	B-Operating_System
Labs	I-Operating_System
announced	O
it	O
would	O
no	O
longer	O
maintain	O
Prism	B-Language
,	O
its	O
ideas	O
having	O
been	O
subsumed	O
into	O
a	O
newer	O
project	O
called	O
Chromeless	B-Language
.	O
</s>
<s>
However	O
,	O
the	O
Mozilla	B-Operating_System
Labs	I-Operating_System
mailing	O
list	O
revealed	O
that	O
Chromeless	B-Language
is	O
not	O
in	O
fact	O
a	O
replacement	O
for	O
Prism	B-Language
,	O
and	O
there	O
is	O
currently	O
no	O
Mozilla	B-Operating_System
replacement	O
for	O
the	O
out-of-the-box	O
site-specific	B-Protocol
browser	I-Protocol
functionality	O
of	O
Prism	B-Language
,	O
Chromeless	B-Language
instead	O
being	O
a	O
platform	O
for	O
developers	O
rather	O
than	O
users	O
.	O
</s>
<s>
For	O
a	O
while	O
Prism	B-Language
continued	O
to	O
be	O
maintained	O
under	O
the	O
original	O
name	O
of	O
WebRunner	O
,	O
which	O
then	O
also	O
was	O
discontinued	O
in	O
September	O
2011	O
.	O
</s>
