In reply to Samppa:
Seriously?
IMO you should be safe enough on the ridge itself (even though I once helped pull a Romanian guy from a crevasse close to the foresummit, so even the ridge itself is not entirely crevasse free).
However, the part of the route between the hut and the Festijoch that mostly uses the Festigletscher is definitely not solo territory in all but the driest conditions (when conversely the ridge is going to be more tricky), and neither is the normal descent route down the heavily glaciated North side and through the glacier basin below the Mischabelgrat.
When I last climbed Dom, admittedly as one of the first teams after some summer snow, we had several partial crevasse falls (the ususal drop to about hip level, stopped by a combination of backpack, self arrest, and of course a tight rope).
Not my first choice for a solo route on one of the Wallis 4000ers.
CB
edit: Just saw that you plan to go early July. Probably the worst time of year for having to trust the snow bridges on the descent route! Actually, depending on the year, you might even want to bring skis.
Post edited at 16:47