<s>
A	O
browser	B-Protocol
toolbar	I-Protocol
is	O
a	O
toolbar	O
that	O
resides	O
within	O
a	O
browser	B-Application
's	I-Application
window	O
.	O
</s>
<s>
All	O
major	B-Protocol
web	I-Protocol
browsers	I-Protocol
provide	O
support	O
to	O
browser	B-Protocol
toolbar	I-Protocol
development	O
as	O
a	O
way	O
to	O
extend	O
the	O
browser	B-Application
's	I-Application
GUI	B-Application
and	O
functionality	O
.	O
</s>
<s>
Browser	B-Protocol
toolbars	I-Protocol
are	O
considered	O
to	O
be	O
a	O
particular	O
kind	O
of	O
browser	B-Protocol
extensions	I-Protocol
that	O
present	O
a	O
toolbar	O
.	O
</s>
<s>
Browser	B-Protocol
toolbars	I-Protocol
are	O
specific	O
to	O
each	O
browser	B-Application
,	O
which	O
means	O
that	O
a	O
toolbar	O
working	O
on	O
a	O
browser	B-Application
does	O
not	O
work	O
on	O
another	O
one	O
.	O
</s>
<s>
All	O
browser	B-Protocol
toolbars	I-Protocol
must	O
be	O
installed	O
in	O
the	O
corresponding	O
browser	B-Application
before	O
they	O
can	O
be	O
used	O
and	O
require	O
updates	O
when	O
new	O
versions	O
are	O
released	O
.	O
</s>
<s>
Many	O
high-profile	O
browser	B-Protocol
toolbars	I-Protocol
released	O
over	O
the	O
years	O
have	O
been	O
fraught	O
with	O
problems	O
,	O
either	O
intentionally	O
as	O
malware	O
or	O
injected	O
with	O
computer	O
viruses	O
or	O
due	O
to	O
poor	O
or	O
conflicting	O
programming	O
when	O
considering	O
multiple	O
toolbars	O
being	O
included	O
on	O
the	O
single	O
browser	B-Application
.	O
</s>
<s>
During	O
the	O
2000s	O
,	O
there	O
was	O
a	O
proliferation	O
of	O
browser	B-Protocol
add-ons	I-Protocol
produced	O
and	O
released	O
by	O
a	O
variety	O
of	O
software	B-Application
companies	I-Application
,	O
both	O
large	O
and	O
small	O
,	O
which	O
were	O
designed	O
to	O
extend	O
the	O
browsing	O
experience	O
for	O
the	O
end	O
user	O
.	O
</s>
<s>
The	O
popularity	O
of	O
browser	B-Protocol
toolbars	I-Protocol
has	O
since	O
declined	O
.	O
</s>
<s>
Many	O
unscrupulous	O
companies	O
use	O
software	O
bundling	O
to	O
force	O
users	O
downloading	O
one	O
program	O
to	O
also	O
install	O
a	O
browser	B-Protocol
toolbar	I-Protocol
,	O
some	O
of	O
which	O
invade	O
the	O
user	O
's	O
privacy	O
by	O
tracking	O
their	O
web	O
history	O
and	O
search	O
history	O
online	O
.	O
</s>
<s>
The	O
programming	O
language	O
and	O
development	O
tools	O
behind	O
a	O
browser	B-Protocol
toolbar	I-Protocol
vary	O
from	O
one	O
browser	B-Application
to	O
another	O
.	O
</s>
<s>
In	O
Internet	B-Protocol
Explorer	I-Protocol
5	I-Protocol
or	O
later	O
,	O
toolbars	O
may	O
be	O
created	O
as	O
browser	B-Protocol
extensions	I-Protocol
written	O
in	O
C#	B-Application
or	O
C++	B-Language
.	O
</s>
<s>
More	O
specifically	O
,	O
it	O
is	O
possible	O
to	O
create	O
up	O
to	O
three	O
different	O
kinds	O
of	O
toolbars	O
(	O
custom	O
explorer	O
bars	O
,	O
tool	O
bands	O
and	O
desk	O
bands	O
)	O
and	O
to	O
combine	O
them	O
with	O
browser	B-Application
helper	I-Application
objects	I-Application
in	O
order	O
to	O
provide	O
added	O
functionality	O
.	O
</s>
<s>
In	O
Firefox	B-Application
,	O
toolbars	O
can	O
be	O
created	O
as	O
add-ons	B-Operating_System
that	O
contribute	O
to	O
the	O
GUI	B-Application
by	O
extending	O
the	O
browser	B-Application
with	O
XUL	B-Application
(	O
support	O
for	O
XUL	B-Application
was	O
removed	O
in	O
Firefox	B-Application
version	O
57	O
)	O
.	O
</s>
<s>
The	O
logic	O
behind	O
the	O
toolbar	O
is	O
written	O
in	O
JavaScript	B-Language
running	O
under	O
expanded	O
privileges	O
.	O
</s>
<s>
Mozilla	O
Jetpack	O
can	O
be	O
used	O
to	O
simplify	O
the	O
development	O
of	O
add-ons	B-Operating_System
for	O
Firefox	B-Application
.	O
</s>
<s>
In	O
Safari	B-Application
5	B-Protocol
or	I-Protocol
later	I-Protocol
toolbars	O
can	O
be	O
created	O
as	O
extensions	O
that	O
add	O
bars	O
and	O
buttons	O
.	O
</s>
<s>
The	O
logic	O
behind	O
the	O
toolbar	O
is	O
written	O
in	O
JavaScript	B-Language
with	O
access	O
to	O
a	O
special	O
JavaScript	B-Language
API	O
to	O
interact	O
with	O
the	O
Safari	B-Application
application	O
and	O
web	O
content	O
.	O
</s>
<s>
In	O
Google	B-Application
Chrome	I-Application
4	I-Application
or	O
later	O
,	O
toolbars	O
can	O
be	O
created	O
as	O
extensions	O
that	O
add	O
browser	B-Application
actions	O
to	O
the	O
browser	B-Application
window	O
.	O
</s>
<s>
The	O
logic	O
behind	O
the	O
toolbar	O
is	O
written	O
in	O
JavaScript	B-Language
with	O
access	O
to	O
a	O
special	O
JavaScript	B-Language
API	O
to	O
interact	O
with	O
the	O
Chrome	B-Application
application	O
and	O
web	O
content	O
.	O
</s>
<s>
The	O
privileges	O
under	O
which	O
a	O
Chrome	B-Application
extension	O
runs	O
are	O
governed	O
by	O
a	O
set	O
of	O
permissions	O
.	O
</s>
<s>
In	O
Opera	B-Application
11	O
or	O
later	O
,	O
toolbars	O
can	O
be	O
created	O
as	O
extensions	O
that	O
add	O
buttons	O
to	O
the	O
browser	B-Application
window	O
.	O
</s>
<s>
The	O
logic	O
behind	O
the	O
toolbar	O
is	O
written	O
in	O
JavaScript	B-Language
with	O
access	O
to	O
a	O
special	O
JavaScript	B-Language
API	O
to	O
interact	O
with	O
the	O
Opera	B-Application
application	O
and	O
web	O
content	O
.	O
</s>
<s>
In	O
Firefox	B-Application
,	O
Chrome	B-Application
,	O
Safari	B-Application
and	O
Opera	B-Application
toolbar	O
styling	O
is	O
done	O
though	O
CSS	B-Language
.	O
</s>
<s>
Some	O
major	O
browsers	B-Application
(	O
Internet	B-Application
Explorer	I-Application
and	O
Firefox	B-Application
)	O
enable	O
the	O
creation	O
of	O
native	O
toolbars	O
i.e.	O
,	O
toolbars	O
which	O
are	O
directly	O
inserted	O
in	O
the	O
browser	B-Application
window	O
.	O
</s>
<s>
Examples	O
of	O
native	O
toolbars	O
are	O
Google	B-Protocol
Toolbar	I-Protocol
and	O
Stumbleupon	O
Toolbar	O
.	O
</s>
<s>
Native	O
toolbars	O
use	O
browser-specific	O
code	O
to	O
create	O
the	O
same	O
toolbar	O
for	O
each	O
different	O
browser	B-Application
version	O
.	O
</s>
<s>
Some	O
toolbar	O
developers	O
use	O
a	O
different	O
approach	O
and	O
make	O
the	O
browser	B-Protocol
extension	I-Protocol
inject	O
a	O
JavaScript	B-Language
file	O
in	O
every	O
web	O
page	O
visited	O
by	O
the	O
user	O
.	O
</s>
<s>
All	O
major	O
browsers	B-Application
support	O
injected	O
toolbars	O
.	O
</s>
<s>
The	O
code	O
in	O
this	O
file	O
inserts	O
the	O
toolbar	O
as	O
a	O
part	O
of	O
the	B-General_Concept
DOM	I-General_Concept
in	O
every	O
web	O
page	O
.	O
</s>
<s>
Injected	O
toolbars	O
use	O
essentially	O
the	O
same	O
JavaScript	B-Language
code	O
to	O
draw	O
the	O
toolbar	O
for	O
each	O
different	O
browser	B-Application
version	O
.	O
</s>
<s>
Native	O
toolbars	O
present	O
faster	O
load	O
times	O
,	O
since	O
injected	O
toolbars	O
must	O
wait	O
for	O
the	B-General_Concept
DOM	I-General_Concept
to	O
be	O
created	O
in	O
order	O
to	O
insert	O
the	O
toolbar	O
in	O
it	O
.	O
</s>
<s>
Injected	O
toolbars	O
require	O
less	O
frequent	O
updates	O
because	O
part	O
of	O
their	O
code	O
is	O
dynamically	O
downloaded	O
in	O
the	O
JavaScript	B-Language
file	O
that	O
draws	O
the	O
toolbar	O
.	O
</s>
<s>
Injected	O
toolbars	O
allow	O
for	O
shorter	O
development	O
times	O
since	O
the	O
JavaScript	B-Language
code	O
that	O
creates	O
the	O
toolbar	O
may	O
be	O
written	O
once	O
for	O
all	O
browsers	B-Application
.	O
</s>
<s>
Injected	O
toolbars	O
allow	O
for	O
an	O
easier	O
toolbar	O
update	O
policy	O
,	O
since	O
changes	O
that	O
are	O
made	O
in	O
the	O
injected	O
JavaScript	B-Language
code	O
do	O
not	O
require	O
releasing	O
a	O
new	O
toolbar	O
version	O
.	O
</s>
<s>
Injected	O
toolbars	O
consume	O
requests	O
to	O
download	O
the	O
JavaScript	B-Language
code	O
that	O
inserts	O
the	O
toolbar	O
in	O
every	O
page	O
,	O
while	O
native	O
toolbars	O
consume	O
no	O
such	O
requests	O
.	O
</s>
<s>
Another	O
way	O
to	O
simplify	O
the	O
task	O
of	O
developing	O
a	O
toolbar	O
for	O
different	O
browsers	B-Application
is	O
to	O
rely	O
on	O
a	O
cross-browser	O
extension	O
development	O
framework	O
.	O
</s>
<s>
Toolbar	O
Studio	O
supports	O
IE	O
,	O
Firefox	B-Application
.	O
</s>
<s>
Neobars	O
supports	O
Chrome	B-Application
,	O
Firefox	B-Application
,	O
IE	O
,	O
Safari	B-Application
and	O
Opera	B-Application
.	O
</s>
<s>
Add-ons	B-Operating_System
Framework	O
supports	O
IE	O
,	O
Firefox	B-Application
,	O
Chrome	B-Application
,	O
Safari	B-Application
,	O
Opera	B-Application
.	O
</s>
<s>
This	O
SDK	O
allows	O
to	O
build	O
browser	B-Protocol
add-ons	I-Protocol
using	O
common	O
JavaScript	B-Language
API	O
.	O
</s>
<s>
Kynetx	O
supports	O
IE	O
,	O
Firefox	B-Application
,	O
Safari	B-Application
,	O
and	O
Chrome	B-Application
,	O
but	O
extensions	O
are	O
dependent	O
on	O
the	O
Kynetx	O
extension	O
to	O
work	O
.	O
</s>
<s>
CrossRider	O
supports	O
IE	O
,	O
Firefox	B-Application
,	O
Chrome	B-Application
and	O
Safari	B-Application
.	O
</s>
<s>
CrossRider	O
is	O
JavaScript	B-Language
and	O
jQuery-based	O
.	O
</s>
<s>
Crossrider	O
also	O
provides	O
auto-update	O
mechanism	O
for	O
code	O
and	O
full	O
stats	O
with	O
country	O
/	O
browser	B-Application
breakdown	O
.	O
</s>
<s>
Crossrider	O
have	O
launched	O
an	O
online	O
real-time	O
IDE	O
for	O
developing	O
cross	O
browser	B-Protocol
extensions	I-Protocol
without	O
the	O
need	O
to	O
download	O
an	O
SDK	O
.	O
</s>
<s>
KangoExtensions	O
supports	O
IE	O
,	O
Firefox	B-Application
,	O
Chrome	B-Application
,	O
Safari	B-Application
and	O
Opera	B-Application
.	O
</s>
<s>
Conduit	O
supports	O
IE	O
,	O
Firefox	B-Application
,	O
Safari	B-Application
,	O
and	O
Chrome	B-Application
.	O
</s>
<s>
Widdit	O
's	O
toolbar	O
supports	O
IE	O
,	O
Firefox	B-Application
,	O
Safari	B-Application
,	O
and	O
Chrome	B-Application
.	O
</s>
<s>
ExtensionMaker	O
supports	O
Firefox	B-Application
,	O
Opera	B-Application
and	O
Chrome	B-Application
.	O
</s>
<s>
The	O
Extension	O
Maker	O
is	O
a	O
desktop-based	O
tool	O
that	O
allows	O
to	O
create	O
stylish	O
and	O
powerful	O
browser	B-Protocol
extensions	I-Protocol
using	O
a	O
drag	O
and	O
drop	O
.	O
</s>
<s>
This	O
process	O
varies	O
by	O
browser	B-Application
type	O
,	O
version	O
,	O
OS	O
,	O
and	O
toolbar	O
provider	O
.	O
</s>
<s>
Many	O
2nd	O
tier	O
providers	O
and	O
software	O
bundled	O
browser	B-Protocol
toolbars	I-Protocol
can	O
be	O
difficult	O
to	O
remove	O
without	O
a	O
3rd	O
party	O
toolbar	O
removal	O
utility	O
.	O
</s>
<s>
The	O
following	O
is	O
a	O
list	O
of	O
web	B-Application
browser	I-Application
toolbar	O
articles	O
on	O
Wikipedia	O
:	O
</s>
