<s>
360	B-Application
Secure	I-Application
Browser	I-Application
(	O
360	B-Application
Security	I-Application
Browser	I-Application
)	O
or	O
360	B-Application
Safe	I-Application
Browser	I-Application
(	O
)	O
is	O
a	O
web	B-Application
browser	I-Application
developed	O
by	O
the	O
Qihoo	O
company	O
of	O
Beijing	O
,	O
China	O
.	O
</s>
<s>
The	O
browser	B-Application
by	O
default	O
renders	O
the	O
webpage	O
using	O
the	O
WebKit-based	O
engine	O
adapted	O
for	O
Google	B-Application
Chrome	I-Application
,	O
Blink	B-Language
,	O
and	O
when	O
running	O
in	O
compatibility	B-Application
mode	I-Application
,	O
it	O
renders	O
webpages	O
using	O
the	O
Trident	B-Application
engine	O
found	O
in	O
Internet	B-Application
Explorer	I-Application
.	O
</s>
<s>
In	O
early	O
2014	O
Qihoo	O
released	O
a	O
global	O
version	O
of	O
its	O
web	B-Application
browser	I-Application
.	O
</s>
<s>
Besides	O
360	B-Application
Secure	I-Application
Browser	I-Application
,	O
there	O
is	O
another	O
version	O
titled	O
360	O
Extreme	O
Browser	B-Application
(	O
360	O
Extreme	O
Explorer	O
)	O
.	O
</s>
<s>
In	O
January	O
2011	O
,	O
Qihoo	O
claimed	O
that	O
it	O
was	O
the	O
second	O
most	O
popular	O
web	B-Application
browser	I-Application
in	O
China	O
(	O
after	O
Internet	B-Application
Explorer	I-Application
)	O
,	O
with	O
172	O
million	O
monthly	O
active	O
users	O
,	O
44.1	O
%	O
of	O
Internet	O
users	O
in	O
China	O
.	O
</s>
<s>
In	O
November	O
2014	O
StatCounter	O
reported	O
that	O
the	O
Qihoo	O
browser	B-Application
was	O
the	O
5th	O
most	O
popular	O
browser	B-Application
in	O
the	O
United	O
States	O
.	O
</s>
<s>
Its	O
main	O
competitors	O
in	O
China	O
are	O
the	O
Sogou	O
High-Speed	O
Browser	B-Application
(	O
)	O
by	O
Sogou	O
,	O
CM	O
Browser	B-Application
(	O
)	O
by	O
Cheetah	O
Mobile	O
,	O
QQ	O
Browser	B-Application
(	O
)	O
by	O
Tencent	O
,	O
Baidu	B-Application
Browser	B-Application
(	O
)	O
by	O
Baidu	B-Application
and	O
Maxthon	B-Application
.	O
</s>
<s>
,	O
the	O
latest	O
versions	O
of	O
360	B-Application
Secure	I-Application
Browser	I-Application
do	O
not	O
offer	O
a	O
distinguishable	O
user-agent	B-Protocol
string	O
.	O
</s>
<s>
It	O
spoofs	O
itself	O
either	O
as	O
Google	B-Application
Chrome	I-Application
or	O
Internet	B-Application
Explorer	I-Application
,	O
making	O
it	O
difficult	O
for	O
developers	O
to	O
target	B-Protocol
or	I-Protocol
identify	I-Protocol
.	O
</s>
<s>
In	O
2012	O
,	O
a	O
whistleblower	O
reported	O
a	O
hidden	O
backdoor	O
in	O
360	B-Application
Secure	I-Application
Browser	I-Application
.	O
</s>
<s>
The	O
Product	O
Director	O
of	O
360	B-Application
Secure	I-Application
Browser	I-Application
,	O
Tao	O
Weihua	O
,	O
responded	O
that	O
"	O
Whoever	O
has	O
a	O
mind	O
to	O
beat	O
a	O
dog	O
will	O
always	O
be	O
able	O
to	O
find	O
a	O
stick	O
"	O
and	O
accused	O
the	O
whistleblower	O
of	O
"	O
smearing	O
360	O
on	O
behalf	O
of	O
Baidu	B-Application
"	O
,	O
which	O
the	O
whistleblower	O
said	O
was	O
"	O
the	O
worst	O
professional	O
response	O
in	O
history	O
"	O
.	O
</s>
<s>
Independent	O
analysis	O
of	O
the	O
claim	O
showed	O
that	O
the	O
browser	B-Application
has	O
an	O
"	O
undeclared	O
mechanism	O
(	O
i.e.	O
,	O
via	O
ExtSmartWiz.dll	O
)	O
which	O
connects	O
to	O
the	O
server	O
on	O
a	O
regular	O
basis	O
(	O
e.g.	O
,	O
every	O
5	O
minutes	O
)	O
,	O
and	O
allows	O
it	O
to	O
download	O
files	O
of	O
any	O
type	O
(	O
including	O
executables	O
)	O
from	O
the	O
server.	O
"	O
</s>
<s>
This	O
and	O
other	O
controversies	O
surrounding	O
Qihoo	O
eventually	O
led	O
to	O
the	O
temporary	O
pulling	O
of	O
their	O
products	O
from	O
the	O
iOS	B-Application
App	I-Application
Store	I-Application
.	O
</s>
<s>
High	O
usage	O
numbers	O
may	O
be	O
due	O
to	O
the	O
browser	B-Application
being	O
difficult	O
to	O
uninstall	O
,	O
its	O
parent	O
product	O
360	O
Safeguard	O
frequently	O
recommending	O
it	O
and	O
a	O
warning	O
pop-up	O
that	O
appears	O
when	O
a	O
user	O
attempts	O
to	O
install	O
another	O
browser	B-Application
,	O
claiming	O
that	O
the	O
other	O
browser	B-Application
is	O
unsafe	O
and	O
should	O
not	O
be	O
run	O
.	O
</s>
