Hmm, could it be an issue of character encoding rather than fonts? Hard to say. Again, ‘not good in FF and IE’ is too vague. What does that mean? Do the characters not show up at all, or …? Without being able to look over your shoulder here, we are blind. We will only know what you tell us, so be specific.
Does LindenHillRegular actually include those characters? If not, the browser will have to find them from another font on your computer. What browser is that a screen shot of, and how does it compare with what you see in grand ole Opry?
Looking at the character map for that font, it doesn’t seem to include the characters you are having trouble with, so I think that’s the problem. The test drive feature makes it look like the characters are available, but that test drive generates an image, not real text, so I doubt it is very reliable.