<s>
This	O
article	O
details	O
features	B-Protocol
of	I-Protocol
the	I-Protocol
Opera	I-Protocol
web	I-Protocol
browser	I-Protocol
.	O
</s>
<s>
Access	O
recently	O
closed	O
pages	O
Opera	B-Application
allows	O
its	O
users	O
to	O
retrieve	O
all	O
of	O
the	O
tabs	O
or	O
windows	O
closed	O
earlier	O
in	O
the	O
current	O
session	B-Protocol
from	O
a	O
list	O
.	O
</s>
<s>
Closed	O
tabs	O
can	O
be	O
recovered	O
in	O
the	O
reverse	O
sequence	O
in	O
which	O
they	O
were	O
closed	O
,	O
by	O
default	O
this	O
is	O
achieved	O
via	O
the	O
keyboard	B-Device
shortcut	O
Ctrl	B-Device
+	O
Shift	O
+	O
T	O
.	O
Users	O
can	O
also	O
access	O
recently	O
closed	O
tabs	O
from	O
other	O
devices	O
synced	O
to	O
their	O
Opera	B-Application
account	O
,	O
including	O
tablets	O
and	O
phones	O
.	O
</s>
<s>
Download	O
manager	O
Opera	B-Application
allows	O
its	O
users	O
to	O
pause	O
,	O
resume	O
,	O
or	O
restart	O
the	O
transfer	O
of	O
files	O
.	O
</s>
<s>
It	O
also	O
keeps	O
the	O
history	O
of	O
downloaded	O
files	O
and	O
allows	O
opening	O
the	O
files	O
—	O
or	O
the	O
folder	O
where	O
the	O
file	O
has	O
been	O
downloaded	O
to	O
—	O
from	O
within	O
the	O
browser	B-Application
.	O
</s>
<s>
When	O
a	O
download	O
begins	O
,	O
a	O
pop-up	O
and	O
a	O
button	O
will	O
appear	O
at	O
the	O
top-right	O
area	O
of	O
the	O
interface	O
to	O
show	O
the	O
download	O
progress	O
.	O
</s>
<s>
Extensions	B-Protocol
Extensions	B-Protocol
allow	O
users	O
to	O
easily	O
add	O
functionality	O
to	O
their	O
Opera	B-Application
browser	I-Application
,	O
as	O
well	O
as	O
share	O
most	O
APIs	B-General_Concept
with	O
the	O
Chromium	B-Language
extension	O
model	O
.	O
</s>
<s>
Developers	O
can	O
easily	O
create	O
extensions	B-Protocol
using	O
open	O
standards	O
(	O
HTML5	B-Application
,	O
CSS	B-Language
,	O
JavaScript	B-Language
)	O
and	O
specific	O
extensions	B-Protocol
can	O
be	O
created	O
to	O
function	O
as	O
Speed	O
Dial	O
items	O
.	O
</s>
<s>
Image	O
loading	O
setting	O
Opera	B-Application
offers	O
the	O
option	O
to	O
load	O
a	O
page	O
without	O
images	O
,	O
or	O
to	O
use	O
only	O
images	O
already	O
in	O
the	O
web	B-Protocol
cache	I-Protocol
.	O
</s>
<s>
This	O
may	O
be	O
useful	O
for	O
users	O
who	O
are	O
connected	O
on	O
dial-up	O
via	O
modem	B-Application
or	O
on	O
a	O
slow	O
wireless/cellular	O
connection	O
that	O
may	O
charge	O
for	O
the	O
amounts	O
of	O
data	O
downloaded	O
.	O
</s>
<s>
Mouse	O
gestures	O
Opera	B-Application
was	O
one	O
of	O
the	O
first	O
browsers	B-Application
to	O
support	O
mouse	O
gestures	O
,	O
which	O
allows	O
patterns	O
of	O
mouse	O
movement	O
to	O
trigger	O
common	O
browsing	O
actions	O
,	O
such	O
as	O
"	O
back	O
"	O
or	O
"	O
refresh	O
"	O
.	O
</s>
<s>
This	O
option	O
is	O
similar	O
to	O
using	O
keyboard	B-Device
shortcuts	O
,	O
as	O
it	O
saves	O
time	O
since	O
users	O
do	O
not	O
have	O
to	O
navigate	O
to	O
graphical	O
buttons	O
using	O
the	O
mouse	O
pointer	O
(	O
thereby	O
avoiding	O
usability	O
problems	O
relating	O
to	O
Fitts	B-General_Concept
 '	I-General_Concept
Law	I-General_Concept
)	O
.	O
</s>
<s>
Zooming	B-Application
—	O
holding	O
down	O
the	O
CTRL	B-Device
key	I-Device
and	O
scrolling	O
the	O
mouse	O
wheel	O
.	O
</s>
<s>
Opera	B-Application
Turbo	O
When	O
Opera	B-Application
Turbo	O
mode	O
is	O
enabled	O
,	O
Opera	B-Application
compresses	B-General_Concept
requested	O
web	O
pages	O
(	O
but	O
not	O
HTTPS	B-Protocol
secure	O
pages	O
)	O
by	O
up	O
to	O
80%	O
,	O
depending	O
upon	O
content	O
,	O
before	O
sending	O
it	O
to	O
the	O
user	O
.	O
</s>
<s>
This	O
technique	O
is	O
also	O
used	O
in	O
Opera	B-Protocol
Mini	I-Protocol
for	O
mobile	O
telephones	O
.	O
</s>
<s>
Around	O
April	O
2019	O
,	O
Opera	B-Application
removed	O
this	O
functionality	O
in	O
its	O
desktop	O
browsers	B-Application
and	O
it	O
's	O
no	O
longer	O
supported	O
on	O
desktop	O
.	O
</s>
<s>
The	O
fate	O
of	O
it	O
on	O
its	O
mobile	B-Application
browsers	I-Application
is	O
uncertain	O
.	O
</s>
<s>
Page	O
zooming	B-Application
Opera	B-Application
offers	O
full	O
page	O
zooming	B-Application
.	O
</s>
<s>
Instead	O
of	O
just	O
making	O
the	O
text	O
bigger	O
,	O
this	O
feature	O
expands	O
all	O
page	O
elements	O
,	O
including	O
text	O
,	O
images	O
,	O
videos	O
,	O
and	O
other	O
content	O
such	O
as	O
Adobe	B-Operating_System
Flash	I-Operating_System
,	O
Java	B-Device
and	O
Scalable	B-Application
Vector	I-Application
Graphics	I-Application
to	O
be	O
increased	O
or	O
decreased	O
in	O
size	O
(	O
25%	O
to	O
500%	O
)	O
.	O
</s>
<s>
Extensions	B-Protocol
may	O
also	O
be	O
used	O
to	O
do	O
this	O
and	O
to	O
enable	O
high	O
contrast	O
coloured	O
fonts	O
.	O
</s>
<s>
Full	O
page	O
zooming	B-Application
prevents	O
inconsistencies	O
that	O
occur	O
when	O
regular	O
text	O
enlargement	O
forces	O
the	O
content	O
to	O
be	O
bigger	O
than	O
its	O
container	O
.	O
</s>
<s>
Zooming	B-Application
can	O
be	O
done	O
using	O
multi-touch	B-Application
pinching	O
gestures	O
on	O
supported	O
platforms	O
.	O
</s>
<s>
Pop-up	O
blocking	O
Opera	B-Application
allows	O
its	O
users	O
to	O
control	O
whether	O
web	O
sites	O
may	O
open	O
pop-up	O
windows	O
.	O
</s>
<s>
By	O
default	O
,	O
Opera	B-Application
blocks	O
all	O
unrequested	O
pop-ups	O
and	O
the	O
behavior	O
may	O
be	O
set	O
on	O
a	O
per-site	O
basis	O
.	O
</s>
<s>
Private	B-Protocol
browsing	I-Protocol
Opera	B-Application
's	O
privacy	B-Protocol
mode	I-Protocol
,	O
Private	B-Protocol
Windows	I-Protocol
,	O
allows	O
users	O
to	O
surf	O
the	O
web	O
without	O
leaving	O
traces	O
of	O
the	O
browsing	O
session	B-Protocol
in	O
that	O
special	O
window	O
.	O
</s>
<s>
Opera	B-Application
's	O
original	O
privacy	O
feature	O
,	O
Private	O
Tabs	O
,	O
allowed	O
users	O
to	O
open	O
a	O
private	B-Protocol
browsing	I-Protocol
session	B-Protocol
in	O
a	O
tab	O
in	O
the	O
current	O
window	O
,	O
instead	O
of	O
a	O
separate	O
window	O
.	O
</s>
<s>
It	O
would	O
not	O
record	O
browsing	B-Protocol
history	I-Protocol
,	O
use	O
the	O
web	B-Protocol
cache	I-Protocol
,	O
or	O
stored	O
passwords	O
,	O
and	O
would	O
forget	O
any	O
information	O
accessed	O
in	O
the	O
Tab	O
when	O
it	O
is	O
closed	O
.	O
</s>
<s>
This	O
feature	O
was	O
replaced	O
by	O
Private	B-Protocol
Windows	I-Protocol
in	O
Opera	B-Application
15	O
.	O
</s>
<s>
Safer	O
address	O
field	O
Opera	B-Application
applies	O
domain	O
highlighting	O
;	O
hides	O
query	B-Protocol
strings	I-Protocol
in	O
order	O
to	O
conceal	O
the	O
complexity	O
of	O
long	O
web	O
addresses	O
;	O
and	O
,	O
instead	O
of	O
displaying	O
the	O
protocol	B-Protocol
,	O
Opera	B-Application
displays	O
a	O
badge	O
that	O
the	O
user	O
can	O
click	O
on	O
to	O
view	O
a	O
security	O
assessment	O
—	O
including	O
information	O
about	O
available	O
SSL	B-Protocol
or	O
TLS	B-Protocol
certificates	O
—	O
for	O
the	O
particular	O
page	O
being	O
visited	O
.	O
</s>
<s>
Search	B-Application
engines	I-Application
Opera	B-Application
provides	O
quick	O
access	O
to	O
a	O
variety	O
of	O
search	B-Application
engines	I-Application
and	O
commerce	O
sites	O
,	O
via	O
the	O
use	O
of	O
search	B-Protocol
plugins	I-Protocol
.	O
</s>
<s>
Many	O
search	B-Protocol
plugins	I-Protocol
are	O
included	O
with	O
the	O
browser	B-Application
,	O
but	O
they	O
can	O
also	O
be	O
user-defined	O
or	O
installed	O
from	O
external	O
sources	O
.	O
</s>
<s>
Since	O
Opera	B-Application
9	O
,	O
a	O
user	O
can	O
right-click	O
a	O
search	O
field	O
on	O
a	O
website	O
and	O
select	O
the	O
"	O
create	O
search	O
"	O
option	O
to	O
add	O
it	O
as	O
a	O
custom	O
search	B-Application
engine	I-Application
.	O
</s>
<s>
The	O
user	O
can	O
select	O
the	O
desired	O
search	B-Application
engine	I-Application
via	O
a	O
list	O
or	O
by	O
using	O
keywords	O
in	O
the	O
address	O
field	O
.	O
</s>
<s>
Example	O
:	O
Opera	B-Application
has	O
a	O
pre-set	O
keyword	O
for	O
using	O
the	B-Application
Google	I-Application
search	B-Application
engine	I-Application
:	O
"	O
g	O
"	O
.	O
</s>
<s>
Therefore	O
,	O
if	O
a	O
user	O
types	O
"	O
g	O
wikipedia	O
"	O
directly	O
into	O
the	O
address	O
field	O
,	O
Opera	B-Application
performs	O
a	O
Google	B-Application
search	O
for	O
"	O
wikipedia	O
"	O
.	O
</s>
<s>
Other	O
keywords	O
are	O
included	O
,	O
including	O
"	O
b	O
"	O
for	O
Bing	B-Application
,	O
"	O
y	O
"	O
for	O
Yahoo	B-Application
!	I-Application
</s>
<s>
Snapshot	O
tool	O
Opera	B-Application
49	O
added	O
a	O
screenshotting	B-Application
tool	O
with	O
editing	O
features	O
,	O
including	O
a	O
selfie	O
mode	O
.	O
</s>
<s>
This	O
feature	O
is	O
based	O
on	O
the	O
speed-dial	O
browsing	O
previously	O
introduced	O
in	O
Opera	B-Protocol
Mini	I-Protocol
.	O
</s>
<s>
New	O
versions	O
of	O
Opera	B-Application
's	O
Speed	O
Dial	O
improved	O
the	O
feature	O
by	O
allowing	O
an	O
unlimited	O
number	O
of	O
speed	O
dial	O
entries	O
,	O
Speed	O
Dial	O
extensions	B-Protocol
,	O
introducing	O
groups	O
,	O
real-time	O
search	O
of	O
entries	O
,	O
added	O
support	O
to	O
user-defined	O
backgrounds	O
and	O
different	O
resolution	O
display	O
layouts	O
(	O
e.g.	O
</s>
<s>
Standalone	O
installation	O
Opera	B-Application
's	O
installer	O
allows	O
users	O
the	O
option	O
to	O
install	O
the	O
browser	B-Application
as	O
a	O
"	O
Standalone	O
Installation	O
(	O
USB	O
)	O
,	O
"	O
which	O
does	O
not	O
make	O
any	O
modifications	O
to	O
the	O
system	O
that	O
it	O
is	O
executed	O
on	O
.	O
</s>
<s>
Tabbed	O
browsing	O
Opera	B-Application
supports	O
tabbed	O
browsing	O
,	O
which	O
allows	O
for	O
multiple	O
web	O
pages	O
to	O
be	O
opened	O
within	O
the	O
same	O
application	O
window	O
.	O
</s>
<s>
Task	O
Manager	O
As	O
Opera	B-Application
is	I-Application
based	O
on	O
Chromium	B-Language
,	O
the	O
Chromium-Browsing-Task	O
Manager	O
,	O
as	O
known	O
from	O
Google	B-Application
Chrome	I-Application
,	O
is	O
also	O
a	O
part	O
of	O
Operas	O
range	O
of	O
features	O
.	O
</s>
<s>
This	O
is	O
not	O
part	O
of	O
the	O
legacy	O
features	O
of	O
Opera	B-Application
12.17	O
.	O
</s>
<s>
VR	O
player	O
Opera	B-Application
is	I-Application
the	O
first	O
web	B-Application
browser	I-Application
to	O
provide	O
support	O
for	O
360-degree	B-General_Concept
videos	I-General_Concept
to	O
be	O
played	O
directly	O
into	O
virtual	B-Application
reality	I-Application
headsets	O
.	O
</s>
<s>
Many	O
notable	O
features	O
,	O
there	O
were	O
available	O
in	O
older	O
versions	O
of	O
the	O
Opera	B-Application
web	I-Application
browser	I-Application
,	O
were	O
removed	O
when	O
Opera	B-Application
switched	O
from	O
its	O
legacy	O
layout	O
engine	O
,	O
Presto	B-Application
,	O
to	O
the	O
Chromium-based	O
Blink	B-Language
engine	I-Language
.	O
</s>
<s>
Presto	B-Application
was	O
introduced	O
in	O
2003	O
(	O
Opera	B-Application
7	O
)	O
and	O
was	O
used	O
until	O
Opera	B-Application
12.18	O
,	O
in	O
2016	O
.	O
</s>
<s>
Search	B-Application
engine	I-Application
aliases	O
Typing	O
an	O
alias	O
in	O
the	O
"	O
omnibar	O
"	O
(	O
combination	O
of	O
address	O
and	O
web	B-Application
search	I-Application
bar	O
)	O
such	O
as	O
g	O
,	O
yt	O
and	O
w	O
prior	O
to	O
the	O
search	O
string	O
launches	O
a	O
search	O
using	O
Google	B-Application
,	O
YouTube	B-General_Concept
and	O
Wikipedia	O
respectively	O
.	O
</s>
<s>
BitTorrent	O
Opera	B-Application
provides	O
the	O
ability	O
to	O
transfer	O
files	O
via	O
a	O
built-in	O
BitTorrent	O
client	O
.	O
</s>
<s>
Bookmarks	O
In	O
Opera	B-Application
15	O
,	O
the	O
classic	O
bookmark	O
functionality	O
was	O
supplanted	O
by	O
an	O
improved	O
Speed	O
Dial	O
and	O
the	O
introduction	O
of	O
the	O
Stash	O
feature	O
.	O
</s>
<s>
Content	O
blocker	O
Content-blocking	B-Protocol
can	O
be	O
used	O
to	O
block	O
any	O
content	O
on	O
a	O
page	O
,	O
including	O
images	O
,	O
plug-ins	B-Application
(	O
e.g.	O
,	O
Flash	B-Operating_System
)	O
,	O
videos	O
,	O
scripts	O
,	O
styles	O
,	O
and	O
other	O
resources	O
.	O
</s>
<s>
Opera	B-Application
stores	O
its	O
content-blocking	B-Protocol
URL	O
list	O
in	O
a	O
file	O
called	O
urlfilter.ini	O
.	O
</s>
<s>
The	O
users	O
are	O
able	O
to	O
sync	O
the	O
content	O
blocker	O
list	O
using	O
Opera	B-Application
Link	O
.	O
</s>
<s>
Personal	O
preferences	O
for	O
toolbar	O
buttons	O
and	O
menus	O
can	O
be	O
arranged	O
with	O
drag	O
and	O
drop	O
,	O
while	O
access	O
to	O
.ini	B-Protocol
files	O
allows	O
one	O
to	O
create	O
,	O
define	O
,	O
or	O
redefine	O
buttons	O
,	O
menus	O
tools	O
and	O
functions	O
.	O
</s>
<s>
Skins	O
:	O
Opera	B-Application
supports	O
customized	O
user-interface	O
skins	O
,	O
allowing	O
users	O
to	O
change	O
the	O
style	O
and	O
size	O
of	O
toolbars	O
,	O
buttons	O
and	O
menus	O
.	O
</s>
<s>
Toolbars	O
:	O
Opera	B-Application
provides	O
toolbars	O
that	O
display	O
different	O
menus	O
and	O
buttons	O
.	O
</s>
<s>
Developer	O
tools	O
Dragonfly	B-Application
is	O
a	O
debugging	B-Application
tool	I-Application
—	O
similar	O
to	O
Firebug	B-Operating_System
and	O
developer	O
tools	O
found	O
in	O
other	O
browsers	B-Application
—	O
that	O
allows	O
debugging	O
of	O
the	O
HTML	B-General_Concept
DOM	I-General_Concept
,	O
JavaScript	B-Language
,	O
CSS	B-Language
,	O
and	O
more	O
.	O
</s>
<s>
Opera	B-Application
Dragonfly	I-Application
also	O
allows	O
debugging	O
from	O
a	O
personal	O
computer	O
a	O
webpage	O
opened	O
on	O
a	O
handheld	O
or	O
other	O
device	O
.	O
</s>
<s>
Dragonfly	B-Application
is	O
written	O
using	O
standard	O
web	O
technology	O
and	O
the	O
Scope	B-Language
protocol	B-Protocol
,	O
and	O
source	O
is	O
available	O
under	O
the	O
Apache	B-Application
License	I-Application
2.0	I-Application
.	O
</s>
<s>
Opera	B-Application
Dragonfly	I-Application
is	O
compatible	O
with	O
Opera	B-Application
products	O
using	O
Presto	B-Application
2.1	O
and	O
later	O
.	O
</s>
<s>
The	O
first	O
stable	O
version	O
of	O
Opera	B-Application
Dragonfly	I-Application
was	O
released	O
on	O
5	O
May	O
2011	O
.	O
</s>
<s>
Fit	O
to	O
width	O
Opera	B-Application
provides	O
a	O
fit-to-width	O
feature	O
that	O
relies	O
on	O
technology	O
similar	O
to	O
Opera	B-Protocol
Mini	I-Protocol
's	O
Small	B-Protocol
Screen	I-Protocol
Rendering	I-Protocol
(	O
SSR	O
)	O
,	O
allowing	O
websites	O
to	O
fit	O
within	O
a	O
smaller	O
screen	O
resolution	O
without	O
the	O
need	O
for	O
horizontal	O
scrolling	O
.	O
</s>
<s>
Full	B-Application
text	I-Application
history	O
search	O
Words	O
typed	O
in	O
the	O
address	O
field	O
perform	O
full-text	B-Application
search	I-Application
in	O
the	O
browser	B-Protocol
history	I-Protocol
.	O
</s>
<s>
Hotclick	B-Protocol
Hotclick	B-Protocol
refers	O
to	O
double-clicking	O
any	O
word	O
in	O
a	O
page	O
and	O
having	O
it	O
to	O
open	O
the	O
context	O
menu	O
instantly	O
,	O
which	O
in	O
Opera	B-Application
includes	O
commands	O
for	O
searching	O
the	O
selected	O
text	O
in	O
search	B-Application
engines	I-Application
and	O
built-in	O
translation	O
,	O
encyclopedia	O
and	O
dictionary	O
services	O
.	O
</s>
<s>
In	O
addition	O
to	O
this	O
,	O
the	O
Hotclick	B-Protocol
menu	O
also	O
gives	O
access	O
to	O
the	O
'	O
copy	O
 '	O
,	O
'	O
copy	O
to	O
note	O
 '	O
(	O
Opera	B-Application
7	O
and	O
later	O
)	O
,	O
and	O
'	O
Send	O
by	O
email	O
 '	O
functions	O
.	O
</s>
<s>
Opera	B-Application
Panels	O
Some	O
tools	O
relating	O
to	O
browsing	O
and	O
email	O
functions	O
are	O
organized	O
within	O
Opera	B-Application
Panels	O
.	O
</s>
<s>
Contacts	O
—	O
email	O
address	B-Operating_System
book	I-Operating_System
.	O
</s>
<s>
Info	O
—	O
displays	O
page-specific	O
information	O
,	O
including	O
its	O
MIME	B-Application
type	I-Application
,	O
local	O
cache	O
,	O
size	O
,	O
security	O
information	O
,	O
and	O
encoding	O
.	O
</s>
<s>
Privacy	O
and	O
security	O
Opera	B-Application
can	O
be	O
configured	O
to	O
use	O
proxy	B-Application
servers	I-Application
,	O
and	O
has	O
a	O
built-in	O
cookie	B-Application
editor	O
and	O
web	B-Protocol
cache	I-Protocol
viewer	O
.	O
</s>
<s>
Also	O
,	O
the	O
password	O
manager	O
integrated	O
into	O
the	O
browser	B-Application
allows	O
users	O
to	O
set	O
a	O
master	O
password	O
to	O
protect	O
against	O
unauthorized	O
tampering	O
or	O
access	O
to	O
stored	O
passwords	O
.	O
</s>
<s>
Users	O
have	O
full	O
control	O
over	O
data	O
supplied	O
to	O
the	O
W3C	B-Language
Geolocation	I-Language
API	I-Language
.	O
</s>
<s>
Usability	O
and	O
accessibility	O
Opera	B-Application
was	O
designed	O
to	O
run	O
well	O
even	O
on	O
low-end	O
and	O
small	O
computers	O
,	O
and	O
with	O
a	O
commitment	O
to	O
computer	O
accessibility	O
for	O
users	O
who	O
may	O
have	O
visual	O
or	O
mobility	O
impairments	O
.	O
</s>
<s>
It	O
is	O
possible	O
to	O
control	O
all	O
main	O
functions	O
of	O
the	O
browser	B-Application
using	O
only	O
the	O
keyboard	B-Device
,	O
and	O
the	O
default	O
keyboard	B-Device
shortcuts	O
can	O
be	O
modified	O
.	O
</s>
<s>
Opera	B-Application
also	O
supports	O
the	O
use	O
of	O
access	B-Device
keys	I-Device
to	O
allow	O
a	O
computer	O
user	O
to	O
immediately	O
jump	O
to	O
a	O
specific	O
part	O
of	O
a	O
web	O
page	O
via	O
the	O
keyboard	B-Device
.	O
</s>
<s>
BB-Code-Keystrokes	O
A	O
user	O
was	O
able	O
to	O
make	O
a	O
text	O
bold	O
,	O
italic	O
and	O
underlined	O
by	O
adding	O
[B][I][U]-tags	O
around	O
the	O
selected	O
text	O
through	O
keyboard	B-Device
shortcuts	O
.	O
</s>
<s>
Mouse	O
gestures	O
(	O
some	O
)	O
Opera	B-Application
used	O
to	O
offer	O
some	O
mouse	O
gestures	O
that	O
are	O
no	O
longer	O
available	O
in	O
the	O
latest	O
version	O
as	O
of	O
now	O
.	O
</s>
<s>
Opera	B-Application
Link	O
;	O
Opera	B-Application
Link	O
allowed	O
users	O
to	O
synchronise	B-General_Concept
their	O
bookmarks	O
,	O
Speed	O
Dial	O
,	O
notes	O
,	O
personal	O
bar	O
,	O
custom	O
search	B-Application
engines	I-Application
,	O
typed	O
history	O
,	O
and	O
the	O
content-blocker	O
list	O
across	O
multiple	O
computers	O
and	O
mobile	O
devices	O
(	O
such	O
as	O
a	O
copy	O
of	O
Opera	B-Protocol
Mini	I-Protocol
running	O
on	O
a	O
mobile	O
phone	O
)	O
.	O
</s>
<s>
Opera	B-Application
Link	O
servers	O
left	O
users	O
with	O
only	O
a	O
month	O
to	O
backup	O
their	O
bookmarks	O
one	O
by	O
one	O
,	O
before	O
the	O
feature	O
was	O
discontinued	O
in	O
2015	O
.	O
</s>
<s>
User	O
data	B-General_Concept
synchronization	I-General_Concept
support	O
was	O
set	O
to	O
return	O
in	O
a	O
later	O
release	O
,	O
though	O
users	O
on	O
Symbian	B-Operating_System
,	O
J2ME	B-Language
and	O
BlackBerry	B-Application
would	O
not	O
have	O
access	O
to	O
it	O
.	O
</s>
<s>
Opera	B-Application
9.50	O
,	O
released	O
12	O
June	O
2008	O
.	O
</s>
<s>
Opera	B-Operating_System
Mail	I-Operating_System
In	O
addition	O
to	O
the	O
web	B-Application
browser	I-Application
,	O
the	O
other	O
main	O
component	O
in	O
the	O
desktop	O
versions	O
of	O
the	O
Opera	B-Application
suite	I-Application
is	O
the	O
Opera	B-Operating_System
Mail	I-Operating_System
email	O
client	O
,	O
which	O
was	O
integrated	O
with	O
the	O
Opera	B-Application
browser	I-Application
until	O
version	O
12	O
.	O
</s>
<s>
Opera	B-Operating_System
Mail	I-Operating_System
supports	O
regular	O
POP	B-Protocol
and	O
SMTP	B-Protocol
mail	O
as	O
well	O
as	O
IMAP	B-Protocol
.	O
</s>
<s>
It	O
also	O
has	O
an	O
Address	B-Operating_System
book	I-Operating_System
.	O
</s>
<s>
Opera	B-Operating_System
Mail	I-Operating_System
also	O
features	O
a	O
newsreader	B-Protocol
and	O
a	O
newsfeed	B-Application
reader	I-Application
for	O
RSS	O
and	O
Atom	B-Application
,	O
as	O
well	O
as	O
an	O
IRC	B-Protocol
client	O
for	O
online	O
chat	O
.	O
</s>
<s>
Private	O
Tabs	O
Opera	B-Application
's	O
Private	O
Tabs	O
were	O
introduced	O
in	O
Opera	B-Application
10.50	O
,	O
allowing	O
users	O
to	O
open	O
a	O
private	B-Protocol
browsing	I-Protocol
session	B-Protocol
in	O
a	O
tab	O
in	O
the	O
current	O
window	O
,	O
instead	O
of	O
a	O
separate	O
window	O
.	O
</s>
<s>
Private	O
Tabs	O
would	O
not	O
record	O
browsing	B-Protocol
history	I-Protocol
,	O
use	O
the	O
web	B-Protocol
cache	I-Protocol
,	O
or	O
stored	O
passwords	O
,	O
and	O
would	O
forget	O
any	O
information	O
accessed	O
in	O
the	O
Tab	O
when	O
it	O
is	O
closed	O
.	O
</s>
<s>
This	O
feature	O
was	O
replaced	O
by	O
Private	B-Protocol
Windows	I-Protocol
in	O
Opera	B-Application
15	O
.	O
</s>
<s>
Sessions	O
Opera	B-Application
allowed	O
users	O
to	O
save	O
all	O
the	O
open	O
tabs	O
and	O
windows	O
as	O
a	O
session	B-Protocol
.	O
</s>
<s>
Opera	B-Application
could	O
then	O
also	O
be	O
set	O
up	O
to	O
start	O
with	O
one	O
of	O
the	O
saved	O
sessions	O
.	O
</s>
<s>
A	O
saved	O
session	B-Protocol
includes	O
the	O
history	O
of	O
each	O
tab	O
and	O
the	O
settings	O
each	O
one	O
had	O
,	O
such	O
as	O
scrolling	O
position	O
,	O
images	O
on/off	O
,	O
etc	O
.	O
</s>
<s>
Since	O
version	O
32	O
this	O
feature	O
can	O
only	O
be	O
achieved	O
with	O
a	O
combination	O
of	O
Speed	O
Dial	O
and	O
Bookmarks	O
,	O
or	O
more	O
elegantly	O
by	O
installing	O
a	O
session-manager	O
extension	O
.	O
</s>
<s>
User	O
JavaScript	B-Language
Opera	B-Application
supported	O
User	O
JavaScript	B-Language
(	O
UserJS	O
)	O
extensions	B-Protocol
,	O
which	O
would	O
execute	O
JavaScript	B-Language
when	O
pages	O
were	O
loaded	O
in	O
order	O
to	O
enhance	O
site	O
functionality	O
.	O
</s>
<s>
UserJS.org,	O
which	O
is	O
currently	O
inactive	O
,	O
was	O
the	O
unofficial	O
central	O
repository	O
for	O
Opera	B-Application
User	O
JavaScripts	B-Language
.	O
</s>
<s>
Scripts	O
designed	O
for	O
the	O
Greasemonkey	B-Operating_System
Firefox	O
extension	O
are	O
listed	O
on	O
Userscripts.org,	O
though	O
many	O
of	O
them	O
also	O
work	O
with	O
Opera	B-Application
.	O
</s>
<s>
As	O
of	O
the	O
latest	O
version	O
,	O
extensions	B-Protocol
can	O
make	O
up	O
for	O
the	O
need	O
for	O
UserJS	O
.	O
</s>
<s>
Widgets	O
Opera	B-Application
Widgets	O
were	O
small	O
standalone	O
applications	O
sitting	O
on	O
the	O
desktop	O
that	O
used	O
the	O
browser	B-Application
's	O
rendering	O
engine	O
.	O
</s>
<s>
Widgets	O
were	O
phased	O
out	O
starting	O
with	O
Opera	B-Application
12	O
.	O
</s>
<s>
Save	O
browsing	B-Protocol
history	I-Protocol
forever	O
until	O
manual	O
deletion	O
.	O
</s>
<s>
Common	O
compatibility	O
problems	O
are	O
caused	O
by	O
websites	O
not	O
following	O
standards	O
or	O
using	O
methods	O
for	O
detecting	B-Protocol
the	I-Protocol
browser	I-Protocol
being	I-Protocol
used	I-Protocol
.	O
</s>
<s>
To	O
cope	O
with	O
outdated	O
detection	O
methods	O
or	O
poorly	O
built	O
websites	O
,	O
Opera	B-Application
enables	O
users	O
to	O
change	O
the	O
information	O
that	O
is	O
sent	O
to	O
websites	O
to	O
identify	O
what	O
kind	O
of	O
browser	B-Application
is	O
being	O
used	O
—	O
known	O
as	O
the	O
user-agent	B-Protocol
.	O
</s>
<s>
In	O
previous	O
years	O
,	O
Opera	B-Application
came	O
preconfigured	O
to	O
partially	O
"	O
cloak	O
"	O
itself	O
as	O
Internet	B-Application
Explorer	I-Application
,	O
but	O
still	O
included	O
the	O
word	O
"	O
Opera	B-Application
"	O
in	O
the	O
user-agent	B-Protocol
information	O
allowing	O
the	O
browser	B-Application
to	O
be	O
counted	O
in	O
web	B-Application
browser	I-Application
statistics	O
.	O
</s>
<s>
As	O
websites	O
modernized	O
themselves	O
and	O
Opera	B-Application
9	O
became	O
more	O
compatible	O
with	O
IE	O
code	O
,	O
Opera	B-Application
began	O
to	O
use	O
its	O
own	O
identification	O
by	O
default	O
.	O
</s>
<s>
Later	O
versions	O
of	O
Opera	B-Application
offered	O
a	O
limited	O
method	O
of	O
cloaking	O
allowing	O
selection	O
from	O
a	O
pre-defined	O
range	O
of	O
options	O
including	O
Mozilla	O
and	O
Internet	B-Application
Explorer	I-Application
.	O
</s>
<s>
If	O
needed	O
,	O
Opera	B-Application
can	O
mask	O
completely	O
as	O
Internet	B-Application
Explorer	I-Application
or	O
Mozilla	O
,	O
leaving	O
out	O
the	O
reference	O
to	O
Opera	B-Application
in	O
the	O
UA	O
string	O
and	O
JavaScript	B-Language
objects	O
.	O
</s>
<s>
Some	O
sites	O
test	O
only	O
for	O
objects	O
that	O
are	O
not	O
present	O
in	O
Opera	B-Application
.	O
</s>
<s>
The	O
version	O
8	O
of	O
Opera	B-Application
introduced	O
a	O
further	O
provision	O
for	O
dealing	O
with	O
faulty	O
coding	O
,	O
by	O
providing	O
a	O
set	O
of	O
scripts	O
in	O
BrowserJS	O
that	O
rewrites	O
known	O
broken	O
pages	O
as	O
they	O
are	O
being	O
opened	O
.	O
</s>
<s>
The	O
closely	O
related	O
UserJS	O
(	O
similar	O
to	O
Mozilla	O
's	O
Greasemonkey	B-Operating_System
)	O
,	O
allows	O
users	O
to	O
run	O
their	O
own	O
code	O
at	O
various	O
times	O
in	O
the	O
processing	O
of	O
a	O
page	O
.	O
</s>
<s>
These	O
techniques	O
have	O
allowed	O
many	O
popular	O
but	O
incompatible	O
sites	O
to	O
be	O
used	O
fully	O
with	O
Opera	B-Application
.	O
</s>
<s>
Opera	B-Application
periodically	O
updates	O
itself	O
with	O
the	O
latest	O
version	O
of	O
BrowserJS	O
and	O
override_downloaded.ini	O
files	O
to	O
keep	O
more	O
sites	O
working	O
correctly	O
in	O
the	O
browser	B-Application
,	O
respectively	O
,	O
they	O
serve	O
to	O
patch	O
websites	O
which	O
would	O
otherwise	O
have	O
issues	O
to	O
run	O
on	O
Opera	B-Application
and	O
to	O
cloak	O
the	O
UA	O
string	O
by	O
default	O
for	O
some	O
website	O
domains	O
.	O
</s>
