Joomla 3.3.1
JoomSEF 4.5.2

I have set the Language Settings of JoomSef to use different subdomains per language. When I click the flag on the language switcher module the corresponding subdomain loads.

I would like to know if there is an automatic redirect to the appropriate subdomain based on the browser settings. The 'Get language from browser setting' is set to Yes but it's not working as it should, and the browser stays on the www.mydomain.com instead of redireting to fr.mydomain.com

Any ideas?