It would be useful to know which font actually gets selected for a particular glyph, and why. In addition, it would be good to know where the font came from (i.e. if it is a system font vs. a web font, and a path to a local font file or the location of the @font-face CSS declaration)
This will likely end up in the web inspector somehow.
*** This bug has been marked as a duplicate of bug 37451 ***