As was anxious to test latest FX3RC1,
i simply followed the Mozillazine thread which shows you how to set up Minefield and have it run side by side with FX2 (c'est la même chose):
1. Create new profile (without starting it);
2. Install FX3RC1 (without running it);
3. Right-click FX3RC1 icon > Properties, on the Target: line add the following:
space hyphen P space profileName
If not, just wait for the latest upgrade, i'm sure it won't be long now.
BTW, FireGestures fails to work on RC1 so, checked out MouseGestures once again and it won't work either. Went over to the creators' page and he made a beta which works! Yay!!!
FireGestures' creator has no beta as of today.
As usual, most extensions are not available but at least i have MouseGestures and AdblockPlus and Google's Notebook!
LocationBar2 won't be necessary anymore in this version.