<s>
Firefox	B-Operating_System
Send	I-Operating_System
was	O
a	O
free	B-License
and	I-License
open-source	I-License
end-to-end	O
encrypted	O
file	O
sharing	O
web	O
service	O
developed	O
by	O
Mozilla	B-Operating_System
.	O
</s>
<s>
Firefox	B-Operating_System
Send	I-Operating_System
allowed	O
users	O
to	O
upload	O
computer	B-Operating_System
files	I-Operating_System
,	O
including	O
large	O
files	O
up	O
to	O
2.5	O
gigabytes	O
,	O
to	O
the	O
Send	O
website	O
,	O
generating	O
links	O
from	O
which	O
the	O
file	O
could	O
be	O
accessed	O
and	O
downloaded	B-Application
.	O
</s>
<s>
Users	O
could	O
also	O
set	O
expiration	O
dates	O
or	O
maximum	O
number	O
of	O
downloads	B-Application
for	O
the	O
links	O
.	O
</s>
<s>
On	O
August	O
1	O
,	O
2017	O
,	O
Mozilla	B-Operating_System
launched	O
Firefox	B-Operating_System
Send	I-Operating_System
via	O
its	O
Test	O
Pilot	O
program	O
.	O
</s>
<s>
The	O
developers	O
wanted	O
to	O
experiment	O
with	O
end-to-end	O
encrypted	O
data	O
syncing	O
and	O
this	O
service	O
allowed	O
them	O
to	O
try	O
out	O
encrypting	O
large	O
files	O
,	O
gigabytes	O
in	O
size	O
,	O
as	O
opposed	O
to	O
the	O
megabytes	O
usually	O
synced	O
by	O
browsers	B-Application
.	O
</s>
<s>
Firefox	B-Operating_System
Send	I-Operating_System
was	O
launched	O
to	O
the	O
public	O
on	O
March	O
12	O
,	O
2019	O
.	O
</s>
<s>
On	O
September	O
17	O
,	O
2020	O
,	O
as	O
a	O
part	O
of	O
Mozilla	B-Operating_System
's	O
business	O
and	O
products	O
refocusing	O
plans	O
,	O
the	O
service	O
was	O
shut	O
down	O
permanently	O
,	O
along	O
with	O
Firefox	O
Notes	O
.	O
</s>
