<s>
Opera	B-Application
is	I-Application
a	O
multi-platform	O
web	B-Application
browser	I-Application
developed	O
by	O
its	O
namesake	O
company	O
Opera	B-Application
.	O
</s>
<s>
The	O
browser	B-Application
is	O
based	O
on	O
Chromium	B-Language
,	O
but	O
distinguishes	O
itself	O
from	O
other	O
Chromium-based	O
browsers	B-Application
(	O
Chrome	B-Application
,	O
Edge	B-Application
,	O
etc	O
.	O
)	O
</s>
<s>
through	O
its	O
user	B-Application
interface	I-Application
and	O
other	B-Protocol
features	I-Protocol
.	O
</s>
<s>
Opera	B-Application
was	O
initially	O
released	O
on	O
10	O
April	O
1995	O
,	O
making	O
it	O
one	O
of	O
the	O
oldest	O
desktop	B-Application
web	B-Application
browsers	I-Application
still	O
actively	O
developed	O
.	O
</s>
<s>
It	O
was	O
commercial	B-Application
software	I-Application
for	O
its	O
first	O
ten	O
years	O
and	O
had	O
its	O
own	O
proprietary	O
layout	O
engine	O
,	O
Presto	B-Application
.	O
</s>
<s>
In	O
2013	O
,	O
it	O
switched	O
from	O
the	O
Presto	B-Application
engine	O
to	O
Chromium	B-Language
.	O
</s>
<s>
Opera	B-Application
is	I-Application
available	O
on	O
Windows	B-Application
,	O
macOS	B-Application
,	O
Linux	B-Application
,	O
Android	B-Application
,	O
and	O
iOS	B-Application
(	O
Safari	B-Application
WebKit	B-Language
engine	O
)	O
.	O
</s>
<s>
There	O
are	O
also	O
mobile	O
versions	O
called	O
Opera	B-Language
Mobile	I-Language
and	O
Opera	B-Protocol
Mini	I-Protocol
.	O
</s>
<s>
Opera	B-Application
users	O
also	O
have	O
access	O
to	O
Opera	B-Application
News	O
,	O
a	O
news	O
app	O
based	O
on	O
an	O
AI	O
platform	O
.	O
</s>
<s>
The	O
company	O
released	O
a	O
gaming-oriented	O
version	O
of	O
the	O
browser	B-Application
,	O
Opera	B-Application
GX	O
,	O
in	O
2019	O
,	O
and	O
a	O
blockchain-focused	O
Opera	B-Application
Crypto	O
Browser	B-Application
into	O
public	O
beta	O
in	O
January	O
2022	O
.	O
</s>
<s>
In	O
1994	O
,	O
Jon	O
Stephenson	O
von	O
Tetzchner	O
and	O
Geir	O
Ivarsøy	O
started	O
developing	O
the	O
Opera	B-Application
web	I-Application
browser	I-Application
while	O
working	O
at	O
Telenor	O
,	O
a	O
Norwegian	O
telecommunications	O
company	O
.	O
</s>
<s>
In	O
1995	O
,	O
they	O
founded	O
Opera	B-Application
Software	O
AS	O
.	O
</s>
<s>
Opera	B-Application
was	O
initially	O
released	O
on	O
10	O
April	O
1995	O
,	O
and	O
then	O
it	O
was	O
released	O
publicly	O
in	O
1996	O
with	O
version	O
2.10	O
,	O
which	O
ran	O
on	O
Microsoft	B-Application
Windows	I-Application
95	I-Application
.	O
</s>
<s>
Opera	B-Application
4.0	O
,	O
released	O
in	O
2000	O
,	O
included	O
a	O
new	O
cross-platform	O
core	O
that	O
facilitated	O
the	O
creation	O
of	O
editions	O
of	O
Opera	B-Application
for	O
multiple	O
operating	B-General_Concept
systems	I-General_Concept
and	O
platforms	O
.	O
</s>
<s>
To	O
this	O
point	O
,	O
Opera	B-Application
was	O
trialware	O
and	O
had	O
to	O
be	O
purchased	O
after	O
the	O
trial	O
period	O
.	O
</s>
<s>
With	O
version	O
5.0	O
,	O
released	O
in	O
2000	O
,	O
Opera	B-Application
became	O
ad-sponsored	O
,	O
displaying	O
ads	O
to	O
users	O
who	O
had	O
not	O
paid	O
for	O
it	O
.	O
</s>
<s>
Subsequent	O
versions	O
have	O
given	O
users	O
the	O
choice	O
of	O
seeing	O
banner	O
ads	O
or	O
targeted	O
text	O
ads	O
from	O
Google	B-Application
.	I-Application
</s>
<s>
With	O
version	O
8.5	O
,	O
released	O
in	O
2005	O
,	O
the	O
ads	O
were	O
completely	O
removed	O
,	O
and	O
the	O
browser	B-Application
's	O
primary	O
financial	O
support	O
came	O
through	O
revenue	O
from	O
Google	B-Application
(	O
by	O
contract	O
,	O
Opera	B-Application
's	O
default	O
search	B-Application
engine	I-Application
)	O
.	O
</s>
<s>
In	O
2006	O
,	O
Opera	B-Application
Software	O
ASA	O
was	O
released	O
as	O
well	O
as	O
Internet	B-Protocol
Channel	I-Protocol
and	O
Nintendo	B-Application
DS	I-Application
Browser	I-Application
for	O
Nintendo	O
's	O
DS	B-Device
and	O
Wii	B-Operating_System
gaming	O
systems	O
.	O
</s>
<s>
A	O
new	O
JavaScript	B-Language
engine	O
,	O
called	O
Carakan	O
(	O
after	O
the	O
Javanese	O
alphabet	O
)	O
,	O
was	O
introduced	O
with	O
version	O
10.50	O
.	O
</s>
<s>
According	O
to	O
Opera	B-Application
Software	O
,	O
it	O
made	O
Opera	B-Application
10.50	O
more	O
than	O
seven	O
times	O
faster	O
in	O
SunSpider	O
than	O
Opera	B-Application
10.10	O
.	O
</s>
<s>
On	O
16	O
December	O
2010	O
,	O
Opera	B-Application
11	O
was	O
released	O
,	O
featuring	O
extensions	B-Protocol
,	O
tab	O
stacking	O
(	O
where	O
dragging	O
one	O
tab	O
over	O
another	O
allowed	O
creating	O
a	O
group	O
of	O
tabs	O
)	O
,	O
visual	O
mouse	O
gestures	O
and	O
changes	O
to	O
the	O
address	O
bar	O
.	O
</s>
<s>
Opera	B-Application
12	O
was	O
released	O
on	O
14	O
June	O
2012	O
.	O
</s>
<s>
On	O
12	O
February	O
2013	O
,	O
Opera	B-Application
Software	O
announced	O
that	O
it	O
would	O
drop	O
its	O
own	O
Presto	B-Application
layout	I-Application
engine	I-Application
in	O
favor	O
of	O
WebKit	B-Language
as	O
implemented	O
by	O
Google	B-Application
's	I-Application
Chrome	B-Application
browser	I-Application
,	O
using	O
code	O
from	O
the	O
Chromium	B-Language
project	I-Language
.	O
</s>
<s>
Opera	B-Application
Software	O
planned	O
as	O
well	O
to	O
contribute	O
code	O
to	O
WebKit	B-Language
.	O
</s>
<s>
On	O
3	O
April	O
2013	O
,	O
Google	B-Application
announced	O
it	O
would	O
fork	O
components	O
from	O
WebKit	B-Language
to	O
form	O
a	O
new	O
layout	O
engine	O
,	O
Blink	B-Language
.	O
</s>
<s>
That	O
day	O
,	O
Opera	B-Application
Software	O
confirmed	O
it	O
would	O
follow	O
Google	B-Application
in	O
implementing	O
Blink	B-Language
.	O
</s>
<s>
On	O
28	O
May	O
2013	O
,	O
a	O
beta	O
release	O
of	O
Opera	B-Application
15	O
was	O
made	O
available	O
,	O
the	O
first	O
version	O
based	O
on	O
the	O
Chromium	B-Language
project	I-Language
.	O
</s>
<s>
Many	O
distinctive	O
Opera	B-Application
features	O
of	O
the	O
previous	O
versions	O
were	O
dropped	O
,	O
and	O
Opera	B-Operating_System
Mail	I-Operating_System
was	O
separated	O
into	O
a	O
standalone	O
application	O
derived	O
from	O
Opera	B-Application
12	O
.	O
</s>
<s>
In	O
January	O
2017	O
,	O
the	O
source	O
code	O
of	O
Opera	B-Application
12.15	O
,	O
one	O
of	O
the	O
last	O
few	O
versions	O
still	O
based	O
on	O
the	O
Presto	B-Application
layout	I-Application
engine	I-Application
,	O
was	O
leaked	O
.	O
</s>
<s>
To	O
demonstrate	O
how	O
radically	O
different	O
a	O
browser	B-Application
could	O
look	O
,	O
Opera	B-Application
Neon	O
,	O
dubbed	O
a	O
"	O
concept	O
browser	B-Application
"	O
,	O
was	O
released	O
in	O
January	O
2017	O
.	O
</s>
<s>
Instead	O
of	O
a	O
Speed	O
Dial	O
(	O
also	O
explained	O
in	O
the	O
following	O
chapter	O
,	O
"	O
Features	O
"	O
)	O
,	O
it	O
displays	O
the	O
frequently	O
accessed	O
websites	O
in	O
resemblance	O
to	O
a	O
desktop	B-Application
with	O
computer	O
icons	O
scattered	O
over	O
it	O
in	O
an	O
artistic	O
formation	O
.	O
</s>
<s>
Opera	B-Application
has	O
originated	O
features	O
later	O
adopted	O
by	O
other	O
web	B-Application
browsers	I-Application
,	O
including	O
:	O
Speed	O
Dial	O
,	O
pop-up	O
blocking	O
,	O
reopening	O
recently	O
closed	O
pages	O
,	O
private	B-Protocol
browsing	I-Protocol
,	O
and	O
tabbed	O
browsing	O
.	O
</s>
<s>
Opera	B-Application
's	O
desktop	B-Application
browser	B-Application
includes	O
access	O
to	O
social	O
media	O
messaging	O
apps	O
WhatsApp	B-Application
,	O
Telegram	B-Application
,	O
Facebook	B-Protocol
Messenger	I-Protocol
,	O
Twitter	B-Application
,	O
Instagram	B-Application
,	O
TikTok	B-Application
,	O
and	O
VK	O
.	O
</s>
<s>
Opera	B-Application
includes	O
a	O
bookmarks	O
bar	O
and	O
a	O
download	B-Protocol
manager	I-Protocol
.	O
</s>
<s>
Opera	B-Application
was	O
one	O
of	O
the	O
first	O
browsers	B-Application
to	O
support	O
Cascading	B-Language
Style	I-Language
Sheets	I-Language
(	O
CSS	B-Language
)	O
in	O
1998	O
.	O
</s>
<s>
Opera	B-Application
Turbo	O
,	O
a	O
feature	O
that	O
compresses	O
requested	O
web	O
pages	O
(	O
except	O
HTTPS	B-Protocol
pages	O
)	O
before	O
sending	O
them	O
to	O
the	O
users	O
,	O
is	O
no	O
longer	O
available	O
on	O
the	O
desktop	B-Application
browser	B-Application
.	O
</s>
<s>
Opera	B-Application
Turbo	O
is	O
available	O
in	O
Opera	B-Protocol
Mini	I-Protocol
,	O
the	O
mobile	O
browser	B-Application
.	O
</s>
<s>
One	O
security	O
feature	O
is	O
the	O
option	O
to	O
delete	O
private	O
data	O
,	O
such	O
as	O
HTTP	B-Application
cookies	I-Application
,	O
browsing	O
history	O
,	O
items	O
in	O
cache	B-Protocol
and	O
passwords	O
with	O
the	O
click	O
of	O
a	O
button	O
.	O
</s>
<s>
When	O
visiting	O
a	O
site	O
,	O
Opera	B-Application
displays	O
a	O
security	O
badge	O
in	O
the	O
address	O
bar	O
which	O
shows	O
details	O
about	O
the	O
website	O
,	O
including	O
security	O
certificates	O
.	O
</s>
<s>
Opera	B-Application
's	O
fraud	O
and	O
malware	O
protection	O
warns	O
the	O
user	O
about	O
suspicious	O
web	O
pages	O
and	O
is	O
enabled	O
by	O
default	O
.	O
</s>
<s>
In	O
2016	O
,	O
a	O
free	O
virtual	O
private	O
network	O
(	O
VPN	O
)	O
service	O
was	O
implemented	O
in	O
the	O
browser	B-Application
.	O
</s>
<s>
Opera	B-Application
said	O
that	O
this	O
would	O
allow	O
encrypted	O
access	O
to	O
websites	O
otherwise	O
blocked	O
,	O
and	O
provide	O
security	O
on	O
public	O
WiFi	O
networks	O
.	O
</s>
<s>
It	O
was	O
later	O
determined	O
that	O
the	O
browser	B-Application
VPN	O
operated	O
as	O
a	O
web	O
proxy	O
rather	O
than	O
a	O
VPN	O
,	O
meaning	O
that	O
it	O
only	O
secured	O
connections	O
made	O
by	O
the	O
browser	B-Application
and	O
not	O
by	O
any	O
other	O
apps	O
on	O
the	O
computer	O
.	O
</s>
<s>
In	O
2018	O
,	O
a	O
built-in	O
cryptocurrency	B-Protocol
wallet	I-Protocol
to	O
the	O
Opera	B-Application
Web	I-Application
Browser	I-Application
was	O
released	O
,	O
announcing	O
that	O
they	O
would	O
be	O
the	O
first	O
browser	B-Application
with	O
a	O
built-in	O
Crypto	B-Protocol
Wallet	I-Protocol
.	O
</s>
<s>
On	O
13	O
December	O
2018	O
,	O
Opera	B-Application
released	O
a	O
video	O
showing	O
many	O
decentralized	O
applications	O
like	O
Cryptokitties	B-Protocol
running	O
on	O
the	O
Android	B-Application
version	O
of	O
the	O
Opera	B-Application
Web	I-Application
Browser	I-Application
.	O
</s>
<s>
In	O
March	O
2020	O
,	O
Opera	B-Application
updated	O
its	O
Android	B-Application
browser	B-Application
to	O
access	O
crypto	O
domains	O
,	O
making	O
it	O
the	O
first	O
browser	B-Application
to	O
be	O
able	O
to	O
support	O
a	O
domain	B-Protocol
name	I-Protocol
system	I-Protocol
(	O
DNS	B-Protocol
)	O
which	O
is	O
not	O
part	O
of	O
the	O
traditional	O
DNS	B-Protocol
directly	O
without	O
the	O
need	O
of	O
a	O
plugin	O
or	O
add-on	O
.	O
</s>
<s>
In	O
January	O
2022	O
,	O
Opera	B-Application
introduced	O
Opera	B-Application
Crypto	O
Browser	B-Application
into	O
public	O
beta	O
,	O
combining	O
a	O
non-custodial	O
wallet	O
with	O
a	O
dedicated	O
browser	B-Application
for	O
blockchain	O
enabled	O
services	O
and	O
Web3	O
technologies	O
.	O
</s>
<s>
On	O
April	O
14	O
2022	O
,	O
Opera	B-Application
launched	O
its	O
Crypto	O
Browser	B-Application
available	O
on	O
iOS	B-Application
devices	O
.	O
</s>
<s>
Opera	B-Application
GX	O
is	O
a	O
gaming-oriented	O
counterpart	O
of	O
Opera	B-Application
.	O
</s>
<s>
The	O
browser	B-Application
was	O
announced	O
and	O
released	O
in	O
early	O
access	O
for	O
Windows	B-Application
on	O
11	O
June	O
2019	O
,	O
during	O
E3	O
2019	O
.	O
</s>
<s>
The	O
macOS	B-Application
version	O
was	O
released	O
in	O
December	O
of	O
the	O
same	O
year	O
.	O
</s>
<s>
Opera	B-Application
GX	O
adds	O
features	O
geared	O
toward	O
gamers	O
on	O
top	O
of	O
the	O
regular	O
Opera	B-Application
browser	I-Application
.	O
</s>
<s>
The	O
browser	B-Application
allows	O
users	O
to	O
limit	O
network	O
,	O
CPU	O
,	O
and	O
memory	O
usage	O
to	O
preserve	O
system	O
resources	O
,	O
with	O
GX	O
Cleaner	O
,	O
a	O
tool	O
that	O
allows	O
users	O
to	O
clear	O
cache	B-Protocol
,	O
cookies	B-Application
,	O
and	O
other	O
unwanted	O
files	O
.	O
</s>
<s>
It	O
also	O
adds	O
integrations	O
with	O
other	O
apps	O
such	O
as	O
Twitch	O
,	O
Discord	B-Application
,	O
Twitter	B-Application
,	O
and	O
Instagram	B-Application
.	O
</s>
<s>
The	O
browser	B-Application
also	O
has	O
a	O
built-in	O
page	O
called	O
the	O
GX	O
Corner	O
,	O
which	O
collates	O
gaming-related	O
releases	O
,	O
deals	O
,	O
and	O
news	O
articles	O
.	O
</s>
<s>
On	O
20	O
May	O
2021	O
,	O
Opera	B-Application
released	O
a	O
mobile	O
version	O
of	O
Opera	B-Application
GX	O
on	O
iOS	B-Application
and	O
Android	B-Application
.	O
</s>
<s>
Opera	B-Application
Software	O
uses	O
a	O
release	O
cycle	O
consisting	O
of	O
three	O
"	O
streams	O
"	O
,	O
corresponding	O
to	O
phases	O
of	O
development	O
,	O
that	O
can	O
be	O
downloaded	O
and	O
installed	O
independently	O
of	O
each	O
other	O
:	O
"	O
developer	O
"	O
,	O
"	O
beta	O
"	O
,	O
and	O
"	O
stable	O
"	O
.	O
</s>
<s>
Opera	B-Application
developer	O
is	O
not	O
intended	O
for	O
everyday	O
browsing	O
as	O
it	O
is	O
unstable	O
and	O
is	O
prone	O
to	O
failure	O
or	O
crashing	O
,	O
but	O
it	O
enables	O
advanced	O
users	O
to	O
try	O
out	O
new	O
features	O
that	O
are	O
still	O
under	O
development	O
,	O
without	O
affecting	O
their	O
normal	O
installation	O
of	O
the	O
browser	B-Application
.	O
</s>
<s>
New	O
versions	O
of	O
the	O
browser	B-Application
are	O
released	O
frequently	O
,	O
generally	O
a	O
few	O
times	O
a	O
week	O
.	O
</s>
<s>
The	O
beta	O
stream	O
,	O
formerly	O
known	O
as	O
"	O
Opera	B-Application
Next	O
,	O
"	O
is	O
a	O
feature	O
complete	O
package	O
,	O
allowing	O
stability	O
and	O
quality	O
to	O
mature	O
before	O
the	O
final	O
release	O
.	O
</s>
<s>
In	O
2005	O
,	O
Adobe	O
Systems	O
integrated	O
Opera	B-Application
's	O
rendering	O
engine	O
,	O
Presto	B-Application
,	O
into	O
its	O
Adobe	B-Operating_System
Creative	I-Operating_System
Suite	I-Operating_System
applications	O
.	O
</s>
<s>
Opera	B-Application
technology	O
was	O
employed	O
in	O
Adobe	B-Language
GoLive	I-Language
,	O
Adobe	B-Operating_System
Photoshop	I-Operating_System
,	O
Adobe	B-Language
Dreamweaver	I-Language
,	O
and	O
other	O
components	O
of	O
the	O
Adobe	B-Operating_System
Creative	I-Operating_System
Suite	I-Operating_System
.	O
</s>
<s>
Opera	B-Application
's	O
layout	O
engine	O
is	O
also	O
found	O
in	O
Virtual	O
Mechanics	O
SiteSpinner	O
Pro	O
.	O
</s>
<s>
The	O
Internet	B-Protocol
Channel	I-Protocol
is	O
a	O
version	O
of	O
the	O
Opera	B-Application
9	O
web	B-Application
browser	I-Application
for	O
use	O
on	O
the	B-Operating_System
Nintendo	I-Operating_System
Wii	I-Operating_System
created	O
by	O
Opera	B-Application
Software	O
and	O
Nintendo	O
.	O
</s>
<s>
Opera	B-Application
Software	O
is	O
also	O
implemented	O
in	O
the	O
Nintendo	B-Application
DS	I-Application
Browser	I-Application
and	O
Nintendo	B-Application
DSi	I-Application
Browser	I-Application
for	O
Nintendo	O
's	O
handheld	O
systems	O
.	O
</s>
<s>
Opera	B-Application
is	I-Application
the	O
fifth	O
most	O
popular	O
web-browser	B-Application
.	O
</s>
<s>
As	O
of	O
April	O
2021	O
,	O
Opera	B-Application
's	O
offerings	O
had	O
over	O
320	O
million	O
active	O
users	O
.	O
</s>
<s>
The	O
Opera	B-Application
browser	I-Application
has	O
been	O
listed	O
as	O
a	O
"	O
tried	O
and	O
tested	O
direct	O
alternative	O
to	O
Chrome	B-Application
"	O
.	O
</s>
<s>
It	O
scores	O
close	O
to	O
Chrome	B-Application
on	O
the	O
HTML5test	O
,	O
which	O
scores	O
browsers’	O
compatibility	O
with	O
different	O
web	O
standards	O
.	O
</s>
<s>
Versions	O
with	O
the	O
Presto	B-Application
layout	I-Application
engine	I-Application
have	O
been	O
positively	O
reviewed	O
,	O
although	O
they	O
have	O
been	O
criticized	O
for	O
website	O
compatibility	O
issues	O
.	O
</s>
<s>
Because	O
of	O
this	O
issue	O
,	O
Opera	B-Application
8.01	O
and	O
higher	O
had	O
included	O
workarounds	O
to	O
help	O
certain	O
popular	O
but	O
problematic	O
web	O
sites	O
display	O
properly	O
.	O
</s>
<s>
Versions	O
with	O
the	O
Blink	B-Language
layout	I-Language
engine	I-Language
have	O
been	O
criticized	O
by	O
some	O
users	O
for	O
missing	O
features	O
such	O
as	O
UI	B-Application
customization	O
,	O
and	O
for	O
abandoning	O
Opera	B-Application
Software	O
's	O
own	O
Presto	B-Application
layout	I-Application
engine	I-Application
.	O
</s>
<s>
Despite	O
that	O
,	O
versions	O
with	O
the	O
Blink	B-Language
layout	I-Language
engine	I-Language
have	O
been	O
noted	O
for	O
being	O
fast	O
and	O
stable	O
,	O
for	O
handling	O
the	O
latest	O
web	O
standards	O
and	O
for	O
having	O
a	O
better	O
website	O
compatibility	O
and	O
a	O
modern-style	O
user	B-Application
interface	I-Application
.	O
</s>
