<s>
Opera	B-Application
Dragonfly	I-Application
is	O
a	O
web	B-Application
development	I-Application
tool	I-Application
that	O
was	O
integrated	O
into	O
the	O
Opera	B-Application
web	I-Application
browser	I-Application
from	O
Opera	B-Application
versions	O
9.5	O
through	O
12.18	O
,	O
similar	O
to	O
Firebug	B-Operating_System
and	O
development	O
tools	O
built	O
into	O
Mozilla	B-Application
Firefox	I-Application
and	O
Google	B-Application
Chrome	I-Application
.	O
</s>
<s>
It	O
supports	O
debugging	O
JavaScript	B-Language
,	O
viewing	O
the	B-General_Concept
DOM	I-General_Concept
,	O
monitoring	O
network	O
traffic	O
,	O
previewing	O
resources	O
,	O
editing	O
colors	O
,	O
etc	O
.	O
</s>
<s>
Opera	B-Application
Dragonfly	I-Application
must	O
be	O
downloaded	O
on	O
first	O
usage	O
,	O
and	O
functions	O
offline	O
thereafter	O
.	O
</s>
<s>
Opera	B-Application
Dragonfly	I-Application
automatically	O
updates	O
to	O
the	O
latest	O
version	O
available	O
,	O
when	O
connected	O
to	O
the	O
Internet	O
.	O
</s>
<s>
Opera	B-Application
Dragonfly	I-Application
is	O
compatible	O
with	O
Presto	B-Application
2.1	O
and	O
later	O
,	O
specifically	O
Opera	B-Language
Mobile	I-Language
9.5	O
and	O
above	O
,	O
Opera	B-Application
Desktop	O
9.5	O
and	O
above	O
,	O
and	O
Nintendo	B-Device
DS	I-Device
&	O
Nintendo	B-Device
DSi	I-Device
Browser	O
.	O
</s>
<s>
The	O
Scope	O
transport	O
protocol	O
(	O
STP	O
)	O
is	O
used	O
for	O
communication	O
between	O
the	O
Opera	B-Application
browser	I-Application
and	O
Opera	B-Application
Dragonfly	I-Application
.	O
</s>
<s>
Development	O
of	O
Opera	B-Application
Dragonfly	I-Application
started	O
in	O
May	O
2008	O
.	O
</s>
<s>
When	O
the	O
development	O
started	O
Opera	B-Application
Dragonfly	I-Application
was	O
using	O
the	O
BSD	B-Operating_System
license	I-Operating_System
,	O
but	O
later	O
on	O
it	O
was	O
changed	O
to	O
the	O
Apache	B-Application
License	I-Application
2.0	I-Application
.	O
</s>
<s>
On	O
21	O
September	O
2011	O
,	O
the	O
Opera	B-Application
Dragonfly	I-Application
team	O
announced	O
that	O
from	O
then	O
on	O
releases	O
would	O
be	O
more	O
focused	O
on	O
improvements	O
to	O
individual	O
components	O
,	O
e.g.	O
</s>
<s>
the	B-General_Concept
DOM	I-General_Concept
inspector	O
or	O
the	O
UI	O
framework	O
.	O
</s>
<s>
As	O
part	O
of	O
the	O
new	O
release	O
strategy	O
,	O
they	O
switched	O
over	O
Opera	B-Application
Dragonfly	I-Application
to	O
a	O
new	O
version	O
scheme	O
:	O
</s>
<s>
Inclusion	O
of	O
Opera	B-Application
Dragonfly	I-Application
ended	O
after	O
Opera	B-Application
12.x	O
,	O
when	O
Opera	B-Application
switched	O
from	O
the	O
Presto	B-Application
layout	I-Application
engine	I-Application
to	O
Blink	B-Language
and	O
a	O
Chromium	B-Language
base	O
.	O
</s>
<s>
Subsequent	O
versions	O
included	O
Chromium	B-Language
's	O
DevTools	B-Application
instead	O
.	O
</s>
