HOWTO: fix maemo browser navigation

Spatial navigation is enabled by default in microb, the default browser in maemo (from OS2008 onwards on the nokia n800 and n810). However many people don't like this behaviour, which seems more appropriate for a device without a touch screen or a mouse pointer.

An easy way to turn spatial navigation off was provided by timeless in the bug report:

navigate to about:config in the browser and set snav.enabled to false.

Direct link: about:config?sprefname=snav.enabled