<s>
Ghostzilla	B-Application
is	O
a	O
discontinued	O
open	B-Application
source	I-Application
web	B-Application
browser	I-Application
for	O
Microsoft	B-Application
Windows	I-Application
based	O
on	O
Mozilla	B-Language
Application	I-Language
Suite	I-Language
1.0.1	O
.	O
</s>
<s>
It	O
ran	O
the	O
browser	B-Application
inside	O
the	O
window	O
space	O
of	O
another	O
application	O
(	O
e.g.	O
</s>
<s>
in	O
Microsoft	B-Application
Outlook	I-Application
)	O
,	O
where	O
the	O
page	O
was	O
then	O
made	O
to	O
look	O
like	O
the	O
content	O
in	O
an	O
email	O
.	O
</s>
<s>
When	O
moving	O
the	O
cursor	O
out	O
of	O
the	O
window	O
,	O
the	O
browser	B-Application
subsequently	O
disappeared	O
.	O
</s>
<s>
Ghostzilla	B-Application
was	O
originally	O
launched	O
as	O
a	O
shareware	B-License
project	O
priced	O
at	O
US	O
$19.95	O
.	O
</s>
<s>
The	O
project	O
then	O
became	O
freeware	B-License
and	O
later	O
open	B-Application
source	I-Application
.	O
</s>
<s>
From	O
May	O
2004	O
until	O
January	O
2005	O
,	O
the	O
project	O
was	O
removed	O
from	O
public	O
view	O
due	O
to	O
a	O
copyright	O
claim	O
from	O
Mozilla	B-Operating_System
.	O
</s>
<s>
It	O
later	O
returned	O
with	O
code	O
directly	O
derived	O
from	O
Mozilla	B-Operating_System
's	O
open	B-Application
source	I-Application
,	O
excluding	O
the	O
core	O
proprietary	O
library	O
used	O
to	O
create	O
minimal	O
pages	O
and	O
desaturated	O
colors	O
.	O
</s>
<s>
In	O
March	O
2006	O
,	O
users	O
of	O
Firefox	B-Application
had	O
the	O
option	O
of	O
installing	O
a	O
free	O
add-on	B-Operating_System
called	O
Ghostfox	B-Application
,	O
which	O
aimed	O
to	O
mimic	O
Ghostzilla	B-Application
's	O
behavior	O
in	O
Firefox	B-Application
,	O
although	O
from	O
June	O
2010	O
this	O
extension	O
was	O
no	O
longer	O
compatible	O
with	O
Firefox	B-Application
3.5	O
.	O
</s>
<s>
An	O
open	B-Application
source	I-Application
project	O
,	O
InstaBrowser	O
,	O
appeared	O
in	O
July	O
2007	O
mimicking	O
Ghostzilla	B-Application
's	O
ideas	O
.	O
</s>
<s>
By	O
September	O
2009	O
this	O
project	O
was	O
renamed	O
Ninja	O
Browser	B-Application
but	O
was	O
again	O
short-lived	O
.	O
</s>
<s>
Ghostzilla	B-Application
is	O
a	O
browser	B-Application
which	O
can	O
be	O
used	O
directly	O
from	O
a	O
CD	O
or	O
USB	O
stick	O
.	O
</s>
<s>
Ghostzilla	B-Application
changes	O
the	O
layout	O
of	O
the	O
web	O
pages	O
pending	O
on	O
the	O
user	O
's	O
preferences	O
as	O
categorized	O
into	O
6	O
different	O
"	O
stealth	O
modes	O
"	O
:	O
</s>
<s>
As	O
simple	O
text	O
(	O
without	O
any	O
CSS	B-Language
,	O
advertisement	O
,	O
or	O
pop-ups	O
)	O
.	O
</s>
<s>
If	O
the	O
cursor	O
is	O
placed	O
outside	O
the	O
Ghostzilla	B-Application
window	O
,	O
Ghostzilla	B-Application
hides	O
itself	O
and	O
can	O
be	O
viewed	O
again	O
by	O
a	O
mouse	O
gesture	O
.	O
</s>
