<s>
Shiira	B-Operating_System
( シイラ	O
,	O
Japanese	O
for	O
the	O
common	O
dolphin-fish	O
)	O
is	O
a	O
discontinued	O
open	B-License
source	I-License
web	B-Application
browser	I-Application
for	O
the	O
Mac	B-Device
OS	I-Device
X	I-Device
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
According	O
to	O
its	O
lead	O
developer	O
Makoto	O
Kinoshita	O
,	O
the	O
goal	O
of	O
Shiira	B-Operating_System
was	O
"	O
to	O
create	O
a	O
browser	B-Application
that	O
is	O
better	O
and	O
more	O
useful	O
than	O
Safari	B-Application
"	O
.	O
</s>
<s>
Shiira	B-Operating_System
used	O
WebKit	B-Language
for	O
rendering	O
and	O
scripting	B-Language
.	O
</s>
<s>
Since	O
the	O
browser	B-Application
was	O
developed	O
with	O
Safari	B-Application
in	O
mind	O
,	O
the	O
main	O
characteristics	O
of	O
the	O
two	O
browsers	B-Application
are	O
similar	O
.	O
</s>
<s>
For	O
example	O
,	O
Shiira	B-Operating_System
employs	O
private	B-Protocol
browsing	I-Protocol
options	O
so	O
that	O
history	O
and	O
cookies	O
are	O
not	O
recorded	O
when	O
activated	O
.	O
</s>
<s>
However	O
,	O
the	O
search	B-Application
engines	I-Application
search	O
field	O
on	O
the	O
toolbar	O
includes	O
many	O
search	B-Application
engines	I-Application
.	O
</s>
<s>
Shiira	B-Operating_System
also	O
uses	O
Cocoa	B-Operating_System
programming	I-Operating_System
to	O
provide	O
users	O
with	O
a	O
customizable	O
drawer	O
extending	O
from	O
the	O
left	O
or	O
right	O
of	O
the	O
window	O
.	O
</s>
<s>
Shiira	B-Operating_System
natively	O
supports	O
in-browser	O
PDF	O
viewing	O
.	O
</s>
<s>
The	O
features	O
of	O
Shiira	B-Operating_System
included	O
appearance	O
options	O
.	O
</s>
<s>
Users	O
could	O
switch	O
between	O
Aqua	B-Application
or	O
Metal	O
styles	O
in	O
addition	O
to	O
changing	O
the	O
buttons	O
 '	O
appearances	O
.	O
</s>
<s>
Another	O
option	O
was	O
"	O
Tab	O
Exposé	O
"	O
,	O
which	O
acted	O
much	O
like	O
the	O
Exposé	O
feature	O
of	O
Mac	B-Device
OS	I-Device
X	I-Device
;	O
each	O
tab	O
was	O
visible	O
in	O
its	O
totality	O
,	O
enabling	O
users	O
to	O
select	O
the	O
tab	O
to	O
which	O
they	O
wished	O
to	O
navigate	O
.	O
</s>
<s>
The	O
1.x	O
releases	O
of	O
Shiira	B-Operating_System
also	O
had	O
a	O
page-turning	O
effect	O
for	O
transitions	O
between	O
any	O
two	O
webpages	O
;	O
however	O
,	O
this	O
was	O
dropped	O
from	O
2.x	O
releases	O
.	O
</s>
<s>
The	O
interface	O
in	O
Shiira	B-Operating_System
2.0	O
could	O
be	O
set	O
to	O
display	O
tabs	O
as	O
thumbnails	O
along	O
the	O
bottom	O
or	O
sides	O
of	O
the	O
window	O
.	O
</s>
<s>
The	O
latest	O
release	O
(	O
version	O
2.3	O
)	O
requires	O
Mac	B-Application
OS	I-Application
X	I-Application
10.4	I-Application
or	O
later	O
.	O
</s>
<s>
Shiira	B-Operating_System
2.3	O
has	O
not	O
been	O
tested	O
on	O
the	O
latest	O
versions	O
of	O
the	O
OS	O
,	O
and	O
has	O
been	O
reported	O
to	O
be	O
buggy	B-Error_Name
on	O
Mac	B-Application
OS	I-Application
X	I-Application
10.5	I-Application
and	O
10.6	B-Device
.	O
</s>
<s>
The	O
final	O
release	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
10.3	I-Operating_System
was	O
1.2.2	O
.	O
</s>
