Compatibility with Firefox 3

Hallo Everybody,
It seems the latest release of Firefox does not recognise the b:xhtml fragement in the Backbase code.

Exemple:

Input in a b:xhtml Fragement

<b:bxml>
input   type="text" name="titre" id="contact_input_titre"/>
</b:bxml>

Then:

<s:task b:action="set" b:target="id('contact_input_titre')/@value" b:value="Mr"/>

Work with Firefox 2 but not with Firefox 3.

Thanks for any help.