imusing firefox29 version.Some browser likes (chrome,IE,Safari) are supported math symbols likes ((-)minus,(+)Add,(*)multiply,degree,etc)firefox not suported.

see the below image (x = x²) symbols not supported

Can you post a link to a publicly accessible page (i.e. no authentication or signing on required)?

Make sure that Unicode is selected for the Character Encoding.

• View > Character Encoding (press F10 to make the Menu bar appear)