How to type german umlaut/german characters in Mozilla mail

[J.S.Sahambi]

I am using Debian/unstable with English language. Occasionaly, I need to 
write letters in Deutsch. I would like to know how to write german 
umlauts and other Deutsch specific characters while still having a 
english version of Mozilla-mail.

Danke

mit bestem Respekt
JSS
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