1) Incorrect behavior of labelClass attribute (screenshot-1):
STEP 1. Use attached file
STEP 2. Find rich:messages component
STEP 3. Set labelClass attribute with the name value of non-existing class
RESULT: Styles of *Class attributes are not overriding by styles from *LableClass attributes, but they have to do it
2) Text-align isn't applyed correctly (screenshot-1), because we use representation of the component as a table with two collumns (for markers, and for labels), something like that:

<TABLE>
<TR>
<TD>
<DIV>
<SPAN>
Warning
</SPAN>
</DIV>
</TD>
<TD>
Warning message
</TD>
</TR>
......
</TABLE>

But mozilla browser build only one collumn, something like that:

<TABLE>
<TR>
<TD>
<SPAN>Warning</SPAN>
<SPAN>Warning message</SPAN>
</TD>
<TR>
......
</TABLE>