<s>
Sleipnir	B-Application
is	O
a	O
tabbed	O
web	B-Application
browser	I-Application
developed	O
by	O
Fenrir	O
Inc	O
.	O
</s>
<s>
The	O
browser	B-Application
's	O
main	O
features	O
are	O
customization	O
and	O
tab	O
functions	O
.	O
</s>
<s>
It	O
supports	O
HTML5	B-Application
and	O
different	O
layout	B-Protocol
engines	I-Protocol
.	O
</s>
<s>
The	O
names	O
Sleipnir	B-Application
and	O
Fenrir	O
are	O
both	O
names	O
of	O
animals	O
from	O
Norse	O
mythology	O
.	O
</s>
<s>
Sleipnir	B-Application
was	O
originally	O
created	O
in	O
Japanese	O
and	O
then	O
released	O
with	O
English	O
and	O
Chinese	O
translations	O
.	O
</s>
<s>
It	O
is	O
available	O
for	O
iOS	B-Application
,	O
macOS	B-Application
,	O
Microsoft	B-Application
Windows	I-Application
,	O
Android	B-Application
,	O
and	O
Windows	B-Protocol
Phone	I-Protocol
.	O
</s>
<s>
Sleipnir	B-Application
was	O
originally	O
developed	O
by	O
Yasuyuki	O
Kashiwagi	O
.	O
</s>
<s>
In	O
November	O
2004	O
,	O
the	O
computer	O
containing	O
Sleipnir	B-Application
's	O
source	O
code	O
was	O
stolen	O
.	O
</s>
<s>
In	O
2005	O
,	O
Kashiwagi	O
established	O
Fenrir	O
&	O
Co	O
.	O
to	O
start	O
development	O
of	O
a	O
new	O
version	O
of	O
Sleipnir	B-Application
.	O
</s>
<s>
As	O
of	O
2006	O
Sleipnir	B-Application
had	O
6%	O
market	O
share	O
in	O
Japan	O
.	O
</s>
<s>
Sleipnir	B-Application
was	O
one	O
of	O
twelve	O
browsers	B-Application
originally	O
offered	O
in	O
a	O
browser	B-Application
ballot	O
screen	O
on	O
the	O
EU	O
edition	O
of	O
Windows	B-Application
7	O
(	O
and	O
XP	O
and	O
Vista	O
with	O
an	O
update	O
)	O
,	O
so	O
users	O
could	O
choose	O
between	O
Internet	B-Application
Explorer	I-Application
and	O
other	O
browsers	B-Application
during	O
the	O
installation	O
process	O
.	O
</s>
<s>
The	O
stable	O
version	O
5.0	O
was	O
released	O
on	O
December	O
24	O
,	O
2013	O
with	O
the	O
latest	O
Blink	B-Language
engine	I-Language
.	O
</s>
<s>
In	O
the	O
Windows	B-Application
version	O
,	O
the	O
browser	B-Application
's	O
layout	B-Protocol
engine	I-Protocol
can	O
be	O
changed	O
.	O
</s>
<s>
Internet	B-Application
Explorer	I-Application
's	O
Trident	B-Application
and	O
Mozilla	B-Operating_System
's	O
Gecko	B-Language
were	O
supported	O
.	O
</s>
<s>
As	O
of	O
version	O
3.5.0.4000	O
,	O
support	O
for	O
the	O
WebKit	B-Language
rendering	O
engine	O
was	O
implemented	O
and	O
Gecko	B-Language
rendering	I-Language
engine	I-Language
support	O
was	O
terminated	O
.	O
</s>
<s>
Other	O
features	O
include	O
tab	O
grouping	O
,	O
mouse	O
gestures	O
,	O
page	O
zooming	O
,	O
a	O
search	O
bar	O
,	O
Greasemonkey-like	O
user	O
script	O
support	O
,	O
and	O
plugin	O
support	O
.	O
</s>
<s>
Bookmarks	O
on	O
Sleipnir	B-Application
can	O
be	O
synced	O
with	O
different	O
platform	O
,	O
using	O
a	O
function	O
called	O
Fenrir	O
Pass	O
.	O
</s>
<s>
Sleipnir	B-Application
version	O
5	O
and	O
onward	O
introduce	O
a	O
proprietary	O
text	O
rendering	O
visually	O
resembling	O
Mac	B-Application
OS	I-Application
text	O
rendering	O
.	O
</s>
<s>
Sleipnir	B-Application
2	O
for	O
Windows	B-Application
:	O
Sleipnir	B-Application
2	O
features	O
customizable	O
functions	O
and	O
add-ons	O
created	O
by	O
users	O
.	O
</s>
<s>
Sleipnir	B-Application
2	O
is	O
one	O
of	O
the	O
few	O
browsers	B-Application
to	O
still	O
support	O
Windows	B-Device
98	I-Device
.	O
</s>
<s>
Sleipnir	B-Application
3	O
for	O
Windows	B-Application
:	O
Includes	O
tab	O
options	O
,	O
tab	O
groups	O
,	O
Touchpaging	O
to	O
flick	O
between	O
tabs	O
using	O
your	O
mouse	O
,	O
and	O
mouse	O
gestures	O
.	O
</s>
<s>
Sleipnir	B-Application
4	O
for	O
Windows	B-Application
:	O
Sleipnir	B-Application
4	O
for	O
Windows	B-Application
has	O
introduced	O
minor	O
interface	O
improvements	O
;	O
Smart	O
Tabs	O
-	O
adding	O
,	O
positioning	O
and	O
deletion	O
of	O
tabs	O
is	O
determined	O
based	O
on	O
relationship	O
with	O
previous	O
and	O
next	O
tabs	O
;	O
150	O
mouse	O
gesture	O
functions	O
added	O
;	O
Google	O
Chrome	O
extensions	O
support	O
.	O
</s>
<s>
Sleipnir	B-Application
4	O
for	O
Mac	O
:	O
Thumbnail	O
Tab	O
Navigation	O
-	O
open	O
tabs	O
are	O
not	O
shrunk	O
anymore	O
,	O
instead	O
they	O
are	O
presented	O
in	O
a	O
scrollable	O
list	O
,	O
with	O
tab	O
titles	O
appearing	O
on	O
mouse	O
hover	O
;	O
Portal	O
field	O
-	O
a	O
bar	O
with	O
a	O
double	O
functionality	O
of	O
navigation	O
bar	O
and	O
search	O
;	O
TiledTab	O
-	O
view	O
mode	O
that	O
gives	O
an	O
overview	O
of	O
the	O
opened	O
tabs	O
and	O
allows	O
sorting	O
tabs	O
into	O
six	O
groups	O
;	O
Improved	O
gesture	O
controls	O
.	O
</s>
<s>
Sleipnir	B-Application
5	O
for	O
Windows	B-Application
:	O
Sleipnir	B-Application
5	O
for	O
Windows	B-Application
has	O
integrated	O
all	O
of	O
the	O
features	O
introduced	O
in	O
Sleipnir	B-Application
4	O
for	O
Mac	O
;	O
Smooth	O
OSX-like	O
font	O
rendering	O
engine	O
introduced	O
;	O
"	O
Site	O
Updates	O
"	O
feature	O
shows	O
personalized	O
recommendations	O
of	O
articles	O
from	O
the	O
often	O
visited	O
sites	O
;	O
Added	O
touch	O
screen	O
support	O
.	O
</s>
<s>
Sleipnir	B-Application
6	O
for	O
Windows	B-Application
:	O
Sleipnir	B-Application
6	O
for	O
Windows	B-Application
adds	O
FavTab	O
for	O
quick	O
navigation	O
to	O
favorite	O
sites	O
;	O
SmartSearch	O
for	O
searching	O
via	O
highlighting	O
;	O
resizable	O
portal	O
field	O
.	O
</s>
<s>
Sleipnir	B-Application
Mobile	O
:	O
The	O
following	O
mobile	O
versions	O
of	O
Sleipnir	B-Application
for	O
smartphones	O
have	O
been	O
released	O
:	O
Android	B-Application
,	O
iOS	B-Application
,	O
Windows	B-Protocol
Phone	I-Protocol
.	O
</s>
<s>
Early	O
Gecko-based	O
versions	O
of	O
Sleipnir	B-Application
for	O
Windows	B-Application
scored	O
positive	O
reviews	O
from	O
CNET	O
for	O
the	O
design	O
and	O
functionality	O
,	O
most	O
noticeably	O
,	O
for	O
the	O
inclusion	O
of	O
gestures	O
.	O
</s>
<s>
MacWorld	O
,	O
while	O
reviewing	O
Sleipnir	B-Application
4	O
for	O
Mac	O
has	O
praised	O
how	O
the	O
URL	O
bar	O
was	O
changed	O
.	O
</s>
<s>
“	O
Opera	O
pioneered	O
that	O
idea	O
,	O
but	O
Sleipnir	B-Application
’s	O
tabs	O
remain	O
constantly	O
visible	O
and	O
strike	O
a	O
nice	O
balance	O
between	O
being	O
large	O
enough	O
to	O
identify	O
but	O
small	O
enough	O
not	O
to	O
intrude	O
on	O
the	O
main	O
browser	B-Application
window.	O
”	O
Despite	O
this	O
,	O
version	O
4	O
was	O
criticized	O
for	O
its	O
poor	O
performance	O
,	O
compared	O
to	O
other	O
browsers	B-Application
using	O
WebKit	B-Language
.	O
</s>
<s>
Later	O
versions	O
of	O
Sleipnir	B-Application
received	O
positive	O
reviews	O
from	O
Softpedia	O
,	O
due	O
to	O
the	O
browser	B-Application
's	O
customizability	O
,	O
features	O
and	O
the	O
availability	O
of	O
mobile	O
versions	O
.	O
</s>
<s>
“	O
Sleipnir	B-Application
proves	O
to	O
be	O
a	O
stable	O
and	O
fast	O
web	B-Application
browser	I-Application
that	O
comes	O
with	O
innovative	O
functions	O
and	O
various	O
customization	O
possibilities	O
.	O
</s>
<s>
In	O
2012	O
,	O
multiple	O
performance	O
tests	O
were	O
performed	O
by	O
Tom	O
's	O
Hardware	O
,	O
where	O
the	O
Android	B-Application
version	O
of	O
Sleipnir	B-Application
was	O
placed	O
on	O
the	O
third	O
spot	O
as	O
the	O
best	O
browser	B-Application
for	O
Android	B-Application
,	O
outrun	O
by	O
Dolphin	B-Application
and	O
Maxthon	B-Application
.	O
</s>
