[Cooker] Problem with firefox plugins

[JPB]

Firefox seems to be build with some totem plugins that prevent me using vlc as 
the embeded video reader.

I have the following message when trying to watch tv:
HTTP protocol source plugin is not installed.

Original message in french when pointing totem (standalone version) to the 
same source:
La lecture de ce film exige le greffon HTTP protocol source qui n' est pas 
installÃ. 

vlc (standalone version) read this OK when pointed to the same source.

And yes mozilla-plugin-vlc is installed but from about:plugins totem plugin is 
the first one ?

JPB