<s>
Cliqz	B-Operating_System
was	O
a	O
privacy-oriented	O
web	B-Application
browser	I-Application
and	O
search	B-Application
engine	I-Application
developed	O
by	O
Cliqz	B-Operating_System
GmbH	I-Operating_System
and	O
majority-owned	O
by	O
Hubert	O
Burda	O
Media	O
.	O
</s>
<s>
It	O
was	O
available	O
as	O
a	O
desktop	O
and	O
mobile	O
web	B-Application
browser	I-Application
as	O
well	O
as	O
an	O
extension	O
for	O
Firefox	B-Application
itself	O
.	O
</s>
<s>
It	O
is	O
a	O
fork	B-Application
of	O
the	O
Firefox	B-Application
web	I-Application
browser	I-Application
with	O
privacy-oriented	O
changes	O
,	O
among	O
which	O
are	O
a	O
crowdsourced	O
anti-tracking	O
mechanism	O
and	O
an	O
in-house	O
search	B-Application
engine	I-Application
embedded	O
within	O
the	O
browser	B-Application
,	O
utilizing	O
its	O
own	O
index	O
of	O
web	O
pages	O
to	O
produce	O
suggestions	O
within	O
the	O
address	O
bar	O
dropdown	O
menu	O
rather	O
than	O
on	O
separate	O
pages	O
.	O
</s>
<s>
The	O
browser	B-Application
's	O
developers	O
argued	O
that	O
other	O
privacy-focused	O
search	B-Application
engines	I-Application
may	O
still	O
pass	O
the	O
user	O
's	O
IP	B-Protocol
address	I-Protocol
to	O
third-party	O
search	O
providers	O
.	O
</s>
<s>
In	O
August	O
2016	O
,	O
Mozilla	B-Operating_System
,	O
the	O
developer	O
of	O
Firefox	B-Application
,	O
made	O
a	O
minority	O
investment	O
in	O
Cliqz	B-Operating_System
.	O
</s>
<s>
Cliqz	B-Operating_System
planned	O
to	O
eventually	O
monetize	O
the	O
software	O
through	O
a	O
program	O
known	O
as	O
Cliqz	B-Operating_System
Offers	O
,	O
which	O
would	O
deliver	O
sponsored	O
offers	O
to	O
users	O
based	O
on	O
their	O
interests	O
and	O
browsing	O
history	O
.	O
</s>
<s>
On	O
15	O
February	O
2017	O
,	O
Cliqz	B-Operating_System
International	O
GmbH	O
,	O
a	O
wholly-owned	O
subsidiary	O
of	O
Cliqz	B-Operating_System
GmbH	I-Operating_System
,	O
acquired	O
the	O
privacy-oriented	O
browser	B-Application
extension	O
Ghostery	B-Operating_System
.	O
</s>
<s>
On	O
29	O
April	O
2020	O
,	O
Cliqz	B-Operating_System
announced	O
it	O
will	O
shut	O
down	O
its	O
browser	B-Application
and	O
search	B-Application
engine	I-Application
.	O
</s>
<s>
Subsequently	O
,	O
the	O
search	B-Application
engine	I-Application
-	O
called	O
Tailcat	O
-	O
was	O
acquired	O
by	O
Brave	B-Application
.	O
</s>
<s>
As	O
of	O
March	O
2021	O
,	O
a	O
browser	B-Application
called	O
Ghostery	B-Operating_System
Dawn	O
was	O
reported	O
to	O
be	O
under	O
development	O
.	O
</s>
<s>
Ghostery	B-Operating_System
Dawn	O
is	O
available	O
for	O
public	O
download	O
in	O
October	O
2021	O
.	O
</s>
<s>
On	O
6	O
October	O
2017	O
,	O
Mozilla	B-Operating_System
announced	O
a	O
test	O
where	O
approximately	O
1%	O
of	O
users	O
downloading	O
Firefox	B-Application
in	O
Germany	O
would	O
receive	O
a	O
version	O
with	O
Cliqz	B-Operating_System
software	O
included	O
.	O
</s>
<s>
The	O
feature	O
provided	O
recommendations	O
directly	O
in	O
the	O
browser	B-Application
's	O
search	O
field	O
.	O
</s>
<s>
The	O
press	O
release	O
noted	O
that	O
"	O
Users	O
who	O
receive	O
a	O
version	O
of	O
Firefox	B-Application
with	O
Cliqz	B-Operating_System
will	O
have	O
their	O
browsing	O
activity	O
sent	O
to	O
Cliqz	B-Operating_System
servers	O
,	O
including	O
the	O
URLs	O
of	O
pages	O
they	O
visit	O
,	O
"	O
and	O
that	O
"	O
Cliqz	B-Operating_System
uses	O
several	O
techniques	O
to	O
attempt	O
to	O
remove	O
sensitive	O
information	O
from	O
this	O
browsing	O
data	O
before	O
it	O
is	O
sent	O
from	O
Firefox.	O
"	O
</s>
<s>
According	O
to	O
the	O
Firefox	B-Application
support	O
website	O
,	O
this	O
version	O
of	O
Firefox	B-Application
collects	O
and	O
sends	O
data	O
to	O
the	O
Cliqz	B-Operating_System
corporation	O
including	O
text	O
typed	O
in	O
the	O
address	O
bar	O
,	O
queries	O
to	O
other	O
search	B-Application
engines	I-Application
,	O
information	O
about	O
visited	O
webpages	O
and	O
interactions	O
with	O
them	O
including	O
mouse	O
movement	O
,	O
scrolling	O
,	O
and	O
amount	O
of	O
time	O
spent	O
;	O
and	O
the	O
user	O
's	O
interactions	O
with	O
the	O
user	O
interface	O
of	O
the	O
Cliqz	B-Operating_System
software	O
.	O
</s>
<s>
Interaction	O
data	O
collected	O
and	O
sent	O
to	O
the	O
Mozilla	B-Operating_System
corporation	O
includes	O
among	O
other	O
things	O
,	O
counts	O
of	O
visits	O
to	O
search	B-Application
engine	I-Application
pages	O
,	O
which	O
search	B-Application
engines	I-Application
are	O
used	O
,	O
and	O
a	O
Cliqz	B-Operating_System
identifier	O
.	O
</s>
<s>
In	O
2018	O
,	O
Cliqz	B-Operating_System
released	O
a	O
version	O
of	O
their	O
browser	B-Application
for	O
iOS	B-Application
called	O
.	O
</s>
<s>
It	O
natively	O
leveraged	O
Cliqz	B-Operating_System
's	O
search	B-Application
engine	I-Application
,	O
,	O
and	O
supported	O
ad-blocking	O
and	O
other	O
privacy	O
features	O
,	O
like	O
an	O
optional	O
built-in	O
VPN	O
with	O
access	O
to	O
25	O
countries	O
.	O
</s>
<s>
Lumen	O
was	O
financially	O
profitable	O
,	O
but	O
was	O
discontinued	O
on	O
May	O
1	O
,	O
2020	O
because	O
of	O
changing	O
directors	O
at	O
Cliqz	B-Operating_System
.	O
</s>
