<s>
A	O
userscript	B-Language
manager	I-Language
is	O
a	O
type	O
of	O
browser	B-Protocol
extension	I-Protocol
and	O
augmented	B-Protocol
browsing	I-Protocol
technology	O
that	O
provides	O
a	O
user	B-Application
interface	I-Application
to	O
manage	O
userscripts	B-Language
.	O
</s>
<s>
The	O
main	O
purpose	O
of	O
a	O
userscript	B-Language
manager	I-Language
is	O
to	O
execute	O
scripts	O
on	O
webpages	O
as	O
they	O
are	O
loaded	O
.	O
</s>
<s>
The	O
most	O
common	O
operations	O
performed	O
by	O
a	O
userscript	B-Language
manager	I-Language
include	O
creating	O
,	O
installing	O
,	O
organizing	O
,	O
deleting	O
and	O
editing	O
scripts	O
,	O
as	O
well	O
as	O
modifying	O
script	O
permissions	O
(	O
e.g.	O
</s>
<s>
Userscript	B-Language
managers	I-Language
use	O
metadata	O
that	O
is	O
embedded	O
in	O
a	O
script	O
's	O
source	O
code	O
primarily	O
to	O
determine	O
the	O
websites	O
it	O
should	O
execute	O
on	O
and	O
the	O
dependencies	B-Application
necessary	O
for	O
the	O
script	O
to	O
run	O
properly	O
.	O
</s>
<s>
A	O
userscript	B-Language
is	O
a	O
computer	O
program	O
(	O
written	O
in	O
JavaScript	B-Language
)	O
containing	O
metadata	O
intended	O
for	O
use	O
by	O
a	O
userscript	B-Language
manager	I-Language
.	O
</s>
<s>
The	O
metadata	O
contains	O
specific	O
delimiters	O
which	O
help	O
the	O
userscript	B-Language
manager	I-Language
distinguish	O
it	O
from	O
ordinary	O
JavaScript	B-Language
files	O
,	O
along	O
with	O
configuration	O
parameters	O
used	O
during	O
installation	O
.	O
</s>
<s>
Typical	O
functions	O
of	O
a	O
userscript	B-Language
manager	I-Language
include	O
:	O
</s>
<s>
Downloading	O
dependencies	B-Application
(	O
e.g.	O
</s>
