<s>
Video	B-Operating_System
DownloadHelper	I-Operating_System
is	O
an	O
extension	B-Operating_System
for	O
the	O
Firefox	B-Application
web	I-Application
browser	I-Application
and	O
Chrome	B-Application
web	I-Application
browser	I-Application
.	O
</s>
<s>
It	O
allows	O
the	O
user	O
to	O
download	O
videos	O
from	O
sites	O
that	O
stream	O
videos	O
through	O
HTTP	B-Protocol
.	I-Protocol
</s>
<s>
The	O
extension	B-Operating_System
was	O
developed	O
by	O
Michel	O
Gutierrez	O
.	O
</s>
<s>
,	O
Video	B-Operating_System
DownloadHelper	I-Operating_System
is	O
the	O
third	O
most	O
popular	O
extension	B-Operating_System
for	I-Operating_System
Firefox	I-Operating_System
(	O
after	O
Adblock	B-Application
Plus	I-Application
and	O
uBlock	B-Protocol
Origin	I-Protocol
)	O
and	O
the	O
second	O
most	O
popular	O
Mozilla-recommended	O
extension	B-Operating_System
with	O
2,848,968	O
users	O
.	O
</s>
<s>
In	O
the	O
second	O
quarter	O
of	O
2015	O
,	O
version	O
5	O
of	O
the	O
extension	B-Operating_System
for	I-Operating_System
Firefox	I-Operating_System
was	O
rebased	O
using	O
Mozilla	O
's	O
Add-ons	B-Operating_System
SDK	O
(	O
previous	O
versions	O
used	O
XUL	B-Application
)	O
.	O
</s>
<s>
Firefox	B-Application
Quantum	O
ceased	O
support	O
for	O
extensions	O
that	O
use	O
XUL	B-Application
or	O
the	O
Add-ons	B-Operating_System
SDK	O
so	O
the	O
extension	B-Operating_System
was	O
rebased	O
using	O
WebExtensions	B-Operating_System
APIs	O
.	O
</s>
<s>
Firefox	B-Application
57.0	O
and	O
Video	B-Operating_System
DownloadHelper	I-Operating_System
7.0.0	O
were	O
released	O
on	O
the	O
same	O
day	O
(	O
14	O
November	O
2017	O
)	O
.	O
</s>
<s>
Eric	O
Griffith	O
of	O
PC	O
Magazine	O
named	O
it	O
one	O
of	O
the	O
best	O
Firefox	B-Operating_System
extensions	I-Operating_System
of	O
2012	O
.	O
</s>
