Firefox help?

I'm having a big problem reading different scripts/fonts on Firefox. I just don't know what happened or what I might have done. It's all in the character encoding, where I can't read Russian Cyrillic script unless I have it set to auto-detect Russian. I want to be able to have it set to auto-detect Universal so that it will detect any language scripts/fonts but it doesn't seem to work. When I set it to auto-detect Universal all it does is go to Western (windows-1252) encoding all the time instead of any other encoding. Is there anyway to set the character encoding so it would pick up other language scripts/fonts other than just individually picking up the one you specifically have selected other than the language the website was written in. I mean I have friends in Russia, Ukraine and Israel and it's quite annoying having to manually switch the encoding setting to be able to read their emails.