Make sure to break out of the loop when converting from UTF-8 to UTF-16 line breakes. Otherwise we could re-use the already converted number and re-convert the value again. This should fix problems on sites like kr.yahoo.com. Not part of the default build.

gfx/src/gtk/nsFontMetricsPango.cpp

@@ -674,6 +674,7 @@ nsFontMetricsPango::GetTextDimensions(const PRUnichar*    aString,
             //      if (aNumCharsFit != aBreaks[i])
             //                printf("Fixing utf8 -> utf16 %d -> %d\n", aNumCharsFit, aBreaks[i]);
             aNumCharsFit = aBreaks[i];
+            break;
         }
     }