Did you try 'Minefield' yet? It seems good! I would not put in the same league as its predecessor yet, since it is still in the alpha stage. But from what I have tried since this morning, there have not been any problems with it.
An advantage with installing Minefield is that it installs into a separate folder from Firefox. Most (not all) of the firefox plugins I had worked seamlessly with Minefield automatically. Even in the Windows Task Manager, the process appears as "firefox.exe". The bookmarks and form passwords I had saved in Firefox also got transferred automatically to Minefield.
FF's themes however are not yet supported in MF. So, am going to be in the testing mode for next 1 week and see how Minefield fares as against Firefox on user experience. In fact, to update this very blog am using Minefield now. Will update my findings later ...