I have a problem:

There are a couple of special characters in Serbian Cyrillic, that do not display correctly in Firefox on openSUSE. Anytime characters such as: ђ, љ, њ etc. appear, theres a т instead of them.

However, as far as I can see, this problem only occurs on Facebook and Twitter. Other Serbian sites display these characters correctly. I have translations-other installed, even tried playing around with character encoding in Firefox, but that did not work. Any idea where I could look next?