Links don't work

[Marvin Shah]

Hi,
i need help concerning Pidgin. After i have uninstalled Chrome und set 
Firefox as Standard Browser, Links i get sent don't open anymore. First, 
i had the standard window "Windows can not open this file type". Now 
that i've updated from 2.6.5 to the newest version this window doesn't 
appear and links just don't open.
What can  do against it?
Thanks a lot!
Marvin