<s>
Pentadactyl	O
is	O
a	O
discontinued	O
Firefox	B-Application
extension	B-Operating_System
forked	B-Application
from	O
the	O
Vimperator	B-Operating_System
and	O
designed	O
to	O
provide	O
a	O
more	O
efficient	O
user	O
interface	O
for	O
keyboard-fluent	O
users	O
.	O
</s>
<s>
The	O
design	O
is	O
heavily	O
inspired	O
by	O
the	O
Vim	B-Application
text	I-Application
editor	I-Application
,	O
and	O
the	O
authors	O
try	O
to	O
maintain	O
consistency	O
with	O
it	O
wherever	O
possible	O
.	O
</s>
<s>
Once	O
activated	O
,	O
Pentadactyl	O
removes	O
all	O
Firefox	B-Application
's	O
default	O
user	B-Application
interface	I-Application
chrome	I-Application
(	O
except	O
for	O
the	O
tab	O
bar	O
)	O
and	O
adds	O
a	O
Vim-inspired	O
command	B-Application
line	I-Application
at	O
the	O
bottom	O
of	O
the	O
window	O
.	O
</s>
<s>
The	O
key	O
bindings	O
and	O
dialog	O
invocation	O
are	O
also	O
changed	O
to	O
those	O
familiar	O
to	O
Vim	B-Application
users	O
.	O
</s>
<s>
Apart	O
from	O
Vim-like	O
features	O
,	O
Pentadactyl	O
includes	O
the	O
Lynx-like	O
links	O
hinting	O
mode	O
,	O
allowing	O
user	O
to	O
enter	O
links	O
manipulation	O
commands	O
referring	O
to	O
the	O
links	O
by	O
labels	O
or	O
numbers	O
.	O
</s>
<s>
As	O
the	O
key	O
mappings	O
of	O
the	O
Pentadactyl	O
differ	O
significantly	O
from	O
those	O
typically	O
expected	O
by	O
web	B-Application
application	I-Application
developers	I-Application
,	O
occasional	O
conflicts	O
of	O
browser	O
-	O
and	O
site-defined	O
key	O
mapping	O
occur	O
.	O
</s>
<s>
Pentadactyl	O
deals	O
with	O
such	O
cases	O
by	O
providing	O
a	O
special	O
"	O
pass-through	O
"	O
mode	O
,	O
which	O
passes	O
all	O
the	O
key	O
press	O
events	O
(	O
except	O
for	O
Esc	B-Device
key	I-Device
)	O
directly	O
to	O
the	O
site	O
.	O
</s>
<s>
This	O
mode	O
can	O
either	O
be	O
activated	O
manually	O
or	O
enforced	O
on	O
a	O
per	O
domain	O
basis	O
with	O
a	O
configuration	B-Protocol
file	I-Protocol
.	O
</s>
<s>
Pentadactyl	O
was	O
forked	B-Application
from	O
the	O
Vimperator	B-Operating_System
Firefox	B-Application
extension	B-Operating_System
after	O
the	O
disagreement	O
over	O
the	O
project	O
directions	O
and	O
governance	O
.	O
</s>
<s>
After	O
the	O
split	O
Pentadactyl	O
differentiated	O
itself	O
with	O
improved	O
start	O
timing	O
,	O
ability	O
to	O
use	O
the	O
extension	B-Operating_System
without	O
restarting	O
Firefox	B-Application
after	O
installation	O
and	O
some	O
changes	O
for	O
consistency	O
with	O
Vim	B-Application
.	O
</s>
<s>
The	O
extension	B-Operating_System
is	O
available	O
as	O
stable	O
releases	O
and	O
nightly	O
builds	O
.	O
</s>
<s>
As	O
of	O
November	O
2020	O
,	O
the	O
project	O
has	O
been	O
on	O
hiatus	O
since	O
March	O
2017	O
due	O
to	O
developer	O
inactivity	O
and	O
noncommunication	O
,	O
and	O
does	O
n't	O
seem	O
to	O
work	O
on	O
Firefox	B-Application
57.0	O
(	O
Firefox	B-Application
Quantum	O
)	O
or	O
newer	O
versions	O
.	O
</s>
<s>
The	O
project	O
was	O
reported	O
still	O
working	O
for	O
Waterfox	B-Language
,	O
Basilisk	O
and	O
Pale	B-Protocol
Moon	I-Protocol
browsers	I-Protocol
,	O
but	O
has	O
since	O
started	O
to	O
degrade	O
due	O
to	O
no	O
updates	O
and	O
will	O
only	O
work	O
after	O
applying	O
community	O
made	O
patches	O
.	O
</s>
<s>
For	O
the	O
Pale	B-Protocol
Moon	I-Protocol
browser	I-Protocol
there	O
is	O
an	O
actively	O
maintained	O
fork	B-Application
of	O
Pentadactyl	O
using	O
the	O
same	O
name	O
being	O
hosted	O
at	O
GitHub	O
.	O
</s>
<s>
In	O
February	O
2011	O
,	O
Erez	O
Zukerman	O
of	O
Download	O
Squad	O
described	O
Pentadactyl	O
as	O
"	O
probably	O
the	O
weirdest	O
and	O
coolest	O
add-on	B-Operating_System
we	O
've	O
ever	O
seen.	O
"	O
</s>
<s>
In	O
June	O
2011	O
,	O
Chad	O
Perrin	O
of	O
TechRepublic	O
noted	O
:	O
"	O
As	O
a	O
former	O
Vimperator	B-Operating_System
user	O
who	O
has	O
spent	O
substantial	O
time	O
in	O
surf	B-Protocol
,	O
Uzbl	B-Protocol
,	O
and	O
Vimium	O
,	O
as	O
well	O
as	O
more	O
cursory	O
time	O
trying	O
out	O
other	O
browsers	O
and	O
Chromium	O
extensions	O
that	O
offer	O
similar	O
interface	O
options	O
,	O
I	O
am	O
much	O
happier	O
with	O
Pentadactyl	O
than	O
any	O
of	O
the	O
alternatives	O
.	O
</s>
