During the l10n session today we came up with an request from dynamis for him to be able to not have a string argument show up in a formatted l10n string.
We came up with the idea to specify zero width in the format, but it's actually precision 0.
foo=does "%1$.0S" work?
as foo.properties does actually yield to
js> sb.formatStringFromName('foo',['Firefox'],1)
does "" work?
So here goes your nifty l10n tip of the day.