<s>
Classilla	B-Protocol
is	O
a	O
Gecko-based	O
Internet	B-Protocol
suite	I-Protocol
for	O
PowerPC-based	O
classic	B-Application
Macintosh	I-Application
operating	I-Application
systems	I-Application
,	O
essentially	O
an	O
updated	O
descendant	O
of	O
the	O
defunct	O
Mozilla	B-Language
Application	I-Language
Suite	I-Language
by	O
way	O
of	O
the	O
Mac	B-Application
OS	I-Application
port	O
maintained	O
in	O
the	O
aborted	O
project	O
.	O
</s>
<s>
The	O
name	O
is	O
a	O
portmanteau	O
of	O
Classic	O
(	O
the	O
classic	B-Application
Mac	I-Application
OS	I-Application
,	O
as	O
defined	O
by	O
the	O
Classic	O
Environment	O
)	O
,	O
and	O
Mozilla	B-Operating_System
.	O
</s>
<s>
Like	O
the	O
Suite	O
it	O
is	O
descended	O
from	O
,	O
Classilla	B-Protocol
offers	O
E-mail	O
(	O
POP/SMTP	O
)	O
,	O
Usenet	B-Application
(	O
NNTP	B-Protocol
)	O
,	O
Gopher	B-Protocol
,	O
FTP	B-Protocol
and	O
World	O
Wide	O
Web	O
(	O
HTTP	B-Protocol
)	O
access	O
,	O
using	O
a	O
modified	O
version	O
of	O
the	O
Gecko	B-Language
layout	I-Language
engine	I-Language
called	O
Clecko	O
.	O
</s>
<s>
Classilla	B-Protocol
also	O
includes	O
its	O
own	O
versions	O
of	O
the	B-General_Concept
DOM	I-General_Concept
Inspector	O
,	O
Mozilla	B-General_Concept
Composer	I-General_Concept
and	O
Venkman	O
components	O
;	O
the	O
former	O
IRC	B-Protocol
ChatZilla	B-Operating_System
component	O
was	O
removed	O
in	O
version	O
9.1	O
.	O
</s>
<s>
Classilla	B-Protocol
was	O
the	O
last	O
updated	O
major	O
browser	B-Application
for	O
classic	B-Application
Mac	I-Application
OS	I-Application
systems	O
,	O
and	O
the	O
only	O
Mozilla-based	O
browser	B-Application
for	O
that	O
environment	O
most	O
recently	O
in	O
maintenance	O
as	O
well	O
,	O
as	O
iCab	B-Operating_System
3	I-Operating_System
's	O
final	O
update	O
was	O
3.0.5	O
in	O
January	O
2008	O
,	O
Opera	B-Application
's	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
support	O
ended	O
with	O
version	O
6.03	O
on	O
20	O
August	O
2003	O
,	O
Internet	B-Protocol
Explorer	I-Protocol
for	I-Protocol
Mac	I-Protocol
on	O
the	O
classic	B-Application
Mac	I-Application
OS	I-Application
ceased	O
development	O
with	O
5.1.7	O
in	O
July	O
2003	O
and	O
Mozilla	B-Operating_System
itself	O
ceased	O
support	O
in	O
2002	O
(	O
see	O
History	O
)	O
.	O
</s>
<s>
The	O
final	O
version	O
of	O
Classilla	B-Protocol
has	O
been	O
released	O
and	O
the	O
suite	O
is	O
no	O
longer	O
supported	O
.	O
</s>
<s>
Classilla	B-Protocol
shared	O
administration	O
with	O
TenFourFox	B-Operating_System
,	O
a	O
fork	B-Application
of	O
Mozilla	B-Application
Firefox	I-Application
for	O
PowerPC-based	O
Macs	O
running	O
Mac	B-Application
OS	I-Application
X	I-Application
Tiger	I-Application
and	O
Mac	B-Application
OS	I-Application
X	I-Application
Leopard	I-Application
.	O
</s>
<s>
Official	O
support	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
(	O
and	O
Mac	B-Operating_System
OS	I-Operating_System
8.6	I-Operating_System
)	O
in	O
the	O
Mozilla	B-Language
Application	I-Language
Suite	I-Language
ended	O
with	O
the	O
release	O
of	O
Mozilla	B-Operating_System
1.2.1	O
in	O
2002	O
,	O
coincident	O
with	O
Apple	O
ending	O
support	O
for	O
their	O
legacy	O
operating	O
system	O
.	O
</s>
<s>
However	O
,	O
many	O
enthusiasts	O
discovered	O
that	O
Mozilla	B-Operating_System
1.3.x	O
would	O
still	O
generally	O
build	O
and	O
run	O
on	O
the	O
old	O
Mac	B-Application
OS	I-Application
with	O
modification	O
apart	O
from	O
its	O
dependencies	O
on	O
CarbonLib	B-Operating_System
(	O
Mozilla	B-Operating_System
1.4.x	O
and	O
newer	O
will	O
not	O
build	O
at	O
all	O
on	O
Mac	B-Operating_System
OS	I-Operating_System
8	I-Operating_System
or	O
9	O
without	O
heavy	O
modification	O
)	O
,	O
leading	O
to	O
builds	O
such	O
as	O
,	O
,	O
and	O
.	O
</s>
<s>
In	O
May	O
2009	O
,	O
Cameron	O
Kaiser	O
announced	O
his	O
intentions	O
to	O
start	O
porting	O
later	O
Mozilla	B-Operating_System
updates	O
back	O
to	O
the	O
1.3.1-based	O
version	O
used	O
in	O
WaMCom	O
,	O
christening	O
his	O
modified	O
version	O
as	O
Classilla	B-Protocol
.	O
</s>
<s>
This	O
first	O
version	O
,	O
given	O
the	O
version	O
number	O
9.0	O
to	O
match	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
(	O
with	O
subsequent	O
numbers	O
matching	O
OS	B-Operating_System
9	I-Operating_System
version	O
numbers	O
)	O
,	O
was	O
released	O
on	O
30	O
June	O
2009	O
.	O
</s>
<s>
Kaiser	O
announced	O
the	O
final	O
official	O
release	O
of	O
Classilla	B-Protocol
and	O
the	O
end	O
of	O
support	O
on	O
March	O
29	O
,	O
2021	O
.	O
</s>
<s>
Owing	O
to	O
Classilla	B-Protocol
's	O
unusual	O
provenance	O
(	O
being	O
essentially	O
a	O
heavily	O
patched	O
version	O
of	O
Mozilla	B-Operating_System
1.3.1	O
;	O
vestigial	O
proof	O
remains	O
in	O
its	O
verse	O
from	O
The	B-Application
Book	I-Application
of	I-Application
Mozilla	I-Application
)	O
,	O
it	O
has	O
more	O
limited	O
support	O
for	O
web	O
standards	O
than	O
do	O
later	O
Gecko-based	O
browsers	B-Application
such	O
as	O
SeaMonkey	B-Language
and	O
Mozilla	B-Application
Firefox	I-Application
,	O
and	O
its	O
layout	O
compared	O
to	O
iCab	B-Operating_System
3.0.5	I-Operating_System
is	O
objectively	O
inferior	O
as	O
the	O
latter	O
browser	B-Application
is	O
Acid2	O
compliant	O
and	O
Classilla	B-Protocol
is	O
not	O
.	O
</s>
<s>
On	O
the	O
other	O
hand	O
,	O
its	O
layout	O
capability	O
is	O
more	O
current	O
than	O
WaMCom	O
or	O
Mozilla	B-Operating_System
1.3.1	O
,	O
and	O
Classilla	B-Protocol
has	O
a	O
more	O
modern	O
JavaScript	B-Language
interpreter	O
than	O
iCab	B-Operating_System
and	O
better	O
support	O
for	O
the	O
Document	B-General_Concept
Object	I-General_Concept
Model	I-General_Concept
although	O
it	O
is	O
also	O
still	O
deficient	O
compared	O
to	O
mainline	O
Gecko-based	O
browsers	B-Application
.	O
</s>
<s>
It	O
is	O
perceived	O
by	O
users	O
to	O
be	O
more	O
stable	O
and	O
quicker	O
to	O
render	O
than	O
iCab	B-Operating_System
,	O
important	O
as	O
the	O
classic	B-Application
Mac	I-Application
OS	I-Application
relies	O
on	O
cooperative	B-Operating_System
multitasking	I-Operating_System
and	O
has	O
very	O
limited	O
support	O
for	O
memory	O
protectionany	O
application	O
crash	O
could	O
hang	O
the	O
entire	O
system	O
.	O
</s>
<s>
However	O
,	O
known	O
problems	O
in	O
the	O
browser	B-Application
and	O
issues	O
with	O
performance	O
on	O
older	O
machines	O
led	O
the	O
developers	O
to	O
implement	O
their	O
own	O
limited	O
version	O
of	O
NoScript	B-Operating_System
as	O
a	O
built-in	O
part	O
of	O
the	O
browser	B-Application
so	O
that	O
users	O
had	O
the	O
ability	O
to	O
enable	O
JavaScript	B-Language
only	O
where	O
it	O
was	O
safe	O
or	O
necessary	O
to	O
do	O
so	O
.	O
</s>
<s>
Classilla	B-Protocol
also	O
adds	O
support	O
for	O
user	B-Protocol
agent	I-Protocol
spoofing	O
,	O
which	O
was	O
not	O
part	O
of	O
the	O
original	O
Mozilla	B-Language
suite	I-Language
,	O
and	O
repairs	O
various	O
Mac	O
OS-specific	O
bugs	O
.	O
</s>
<s>
In	O
addition	O
,	O
Classilla	B-Protocol
9.3.0	O
introduced	O
the	O
Byblos	O
HTML	O
rewriting	O
engine	O
that	O
can	O
rewrite	O
individual	O
pages	O
at	O
the	O
source	O
code	O
level	O
with	O
browser	B-Application
-	O
and	O
user-provided	O
"	O
stele	O
"	O
scripts	O
,	O
with	O
the	O
intent	O
of	O
lightweight	O
adaptation	O
of	O
complicated	O
content	O
to	O
the	O
capabilities	O
or	O
quirks	O
of	O
the	O
browser	B-Application
.	O
</s>
<s>
Starting	O
with	O
9.3.0	O
,	O
Classilla	B-Protocol
presents	O
a	O
mobile	O
user	B-Protocol
agent	I-Protocol
by	O
default	O
.	O
</s>
<s>
Apart	O
from	O
its	O
upgraded	O
support	O
for	O
Web	O
pages	O
,	O
Classilla	B-Protocol
supports	O
most	O
of	O
the	O
same	O
features	O
that	O
Mozilla	B-Operating_System
of	O
the	O
same	O
generation	O
did	O
,	O
with	O
similar	O
feature	O
sets	O
and	O
bugs	O
in	O
its	O
support	O
for	O
E-mail	O
,	O
Usenet	B-Application
,	O
FTP	B-Protocol
and	O
Gopher	B-Protocol
,	O
although	O
the	O
latter	O
received	O
token	O
upgrades	O
.	O
</s>
<s>
In	O
a	O
likewise	O
fashion	O
,	O
Classilla	B-Protocol
also	O
inherits	O
many	O
of	O
the	O
security	O
failings	O
of	O
earlier	O
versions	O
of	O
the	O
Application	O
Suite	O
,	O
many	O
of	O
which	O
are	O
still	O
not	O
patched	O
and	O
openly	O
warned	O
of	O
by	O
the	O
developers	O
.	O
</s>
<s>
The	O
presence	O
of	O
NoScript	B-Operating_System
,	O
along	O
with	O
the	O
unusual	O
nature	O
of	O
the	O
classic	B-Application
Mac	I-Application
OS	I-Application
,	O
is	O
thought	O
to	O
add	O
some	O
level	O
of	O
protection	O
,	O
although	O
it	O
was	O
the	O
avowed	O
goal	O
of	O
the	O
developers	O
to	O
reach	O
security	O
parity	O
with	O
modern	O
Mozilla-based	O
releases	O
and	O
repair	O
outstanding	O
bugs	O
.	O
</s>
