How can I get Firefox to default to Unicode rather that Western ?

Question

This is the same question as the unanswered, archived thread https://support.mozilla.org/en-US/questions/989012?fpa=1
Firefox 33.0 displays mojibake+English instead of Japanese+English. It shouldn't matter whether the web page is encoded in ShiftJIS, EUC, raw JIS (though that's rare), or UTF8; all of them should be easy to autodetect.
I can go to the View menu, Character Encoding, and select Japanese, but this should not be necessary. I shouldn't have to teach it to ordinary users.
View - Character Encoding - Auto-detect is off, but even if I set that to Japanese it doesn't help. Hypothetically even if it helped Japanese it wouldn't help Greek.
If I understand correctly there used to be an option View - Character Encoding - Universal, but that option was removed? WTF???????????????????????????????
I've read a few expert opinions that I should change the web server to ... I'm not sure what I should change it to, because looking at the page again it seems that it already says Unicode ... but anyway, I don't think one of Japan's largest transportation companies will let one of their smallest personal individual customers barge in and reprogram their web server.
http://www.sagawa-sgx.com/sgx/trackeng.asp?CAT=AWB&enc=ENG&AWB=25903880-0
This part probably didn't help but shouldn't hurt too much:
body{
background-color:darkblue;
font-family:Arial;
font-size:12px;
background: #ffffff;
This part should help, shouldn't it?:
<meta http-equiv="Content-Type" content="text/html; charset=unicode">
How can I set auto-detect to use information from the web page, and to turn on auto-detection for web sites that don't say?

Answer 1

For the third time: THE PAGE SENDS A META TAG:
<meta http-equiv="Content-Type" content="text/html; charset=unicode">
but FF is auto-defaulting to Western and mojibake.
"If the page uses Unicode then this should always work."
What does the word "this" refer to? The fallback (manual auto-detect setting) worked for this page because this page only contains Japanese and English, and Japanese character sets include the Italian characters that are used in writing English. But, for the third time again, shouldn't FF automatically auto-detect it, and even for manual auto-detecting why was the Universal option deleted?