[Wmlbrowser] Impossible update to wmlbrowser version 0.7.4

[SoftMail]

Hallo

Firefox informed me that i have version 0.7.3 of wmlbrowser and that i 
shall update to version 0.7.4, but allways i do so, i still seem to have 
version 0.7.3!!! I also deinstalled wmlbrowser 0.7.3 and tried to 
install version 0.7.4, but afterwards firefox again says that i still 
have version 0.7.3!!! Do you have any idea what's goin' on there?