Fix Console Scrollbars in Firefox

[jrmartin]

We are currently using a plugin to create our console in Geppetto, http://josscrowcroft.github.io/javascript-sandbox-console/ .

This is working fine in Chrome and all other webkit browser, but is not styling the scrollbars for the console in Firefox and they become visible as seen in the picture.

Ideally the vertical scrollbar would be transparent, and the horizontal one should be invisible.

Due a bug reported in the Mozilla site https://bugzilla.mozilla.org/show_bug.cgi?id=77790, we can't style scrollbars in Firefox. A possibility to solve this will be to use jquery scroll pane