Apparently this is a "bug" in Firefox, https://bugs.launchpad.net/ubuntu/+source/emacs24/+bug/1425972 but I have no idea what is being considered the "bug" and how they are fixing it.
I suggest you switch to VM 8.2.0b, and use the "browse-url" menu item. It uses the standard Emacs library to send url's to browsers.
Apparently this is a "bug" in Firefox, /bugs.launchpad .net/ubuntu/ +source/ emacs24/ +bug/1425972
https:/
but I have no idea what is being considered the "bug" and how they are fixing it.
I suggest you switch to VM 8.2.0b, and use the "browse-url" menu item. It uses the standard Emacs library to send url's to browsers.