<s>
Chrome	B-Application
Web	I-Application
Store	I-Application
is	O
Google	B-Application
's	I-Application
online	O
store	O
for	O
its	O
Chrome	B-Application
web	I-Application
browser	I-Application
.	O
</s>
<s>
As	O
of	O
2022	O
,	O
Chrome	B-Application
Web	I-Application
Store	I-Application
hosts	O
about	O
123,000	O
extensions	B-Protocol
and	O
29,000	O
themes	O
.	O
</s>
<s>
Chrome	B-Application
Web	I-Application
Store	I-Application
was	O
publicly	O
unveiled	O
in	O
December	O
2010	O
,	O
and	O
was	O
opened	O
on	O
February	O
11	O
,	O
2011	O
,	O
with	O
the	O
release	O
of	O
Google	B-Application
Chrome	I-Application
9.0	O
.	O
</s>
<s>
As	O
of	O
June	O
2012	O
,	O
there	O
were	O
750	O
million	O
total	O
installs	O
of	O
content	O
hosted	O
on	O
Chrome	B-Application
Web	I-Application
Store	I-Application
.	O
</s>
<s>
Some	O
extension	B-Protocol
developers	O
have	O
sold	O
their	O
extensions	B-Protocol
to	O
third-parties	O
who	O
then	O
incorporated	O
adware	O
.	O
</s>
<s>
In	O
2014	O
,	O
Google	B-Application
removed	O
two	O
such	O
extensions	B-Protocol
from	O
Chrome	B-Application
Web	I-Application
Store	I-Application
after	O
many	O
users	O
complained	O
about	O
unwanted	O
pop-up	O
ads	O
.	O
</s>
<s>
The	O
following	O
year	O
,	O
Google	B-Application
acknowledged	O
that	O
about	O
five	O
percent	O
of	O
visits	O
to	O
its	O
own	O
websites	O
had	O
been	O
altered	O
by	O
extensions	B-Protocol
with	O
adware	O
.	O
</s>
<s>
Malware	O
remains	O
a	O
problem	O
on	O
Chrome	B-Application
Web	I-Application
Store	I-Application
.	O
</s>
<s>
In	O
January	O
2018	O
,	O
security	O
researchers	O
found	O
four	O
malicious	O
extensions	B-Protocol
with	O
more	O
than	O
500,000	O
combined	O
downloads	O
.	O
</s>
<s>
In	O
February	O
2021	O
,	O
Google	B-Application
blocked	O
"	O
The	O
Great	O
Suspender	O
"	O
,	O
a	O
popular	O
extension	B-Protocol
with	O
2,000,000	O
users	O
after	O
it	O
was	O
reported	O
that	O
malicious	O
code	O
was	O
added	O
to	O
it	O
.	O
</s>
<s>
Chrome	B-Application
used	O
to	O
allow	O
extensions	B-Protocol
hosted	O
on	O
Chrome	B-Application
Web	I-Application
Store	I-Application
to	O
also	O
be	O
installed	O
at	O
the	O
developer	O
's	O
website	O
for	O
the	O
sake	O
of	O
convenience	O
.	O
</s>
