In the midst of winter Olympics, we just released updated version 6.0.3. (Now we can sit back and enjoy the last few days of the games!)
We have updated Gecko engine to the latest revision 188.8.131.52, which is the same as Firefox 3.5.8. As you can see from Mozilla's release note here, this includes several security and stability fix and we strongly encourage you to update yours soon.
We have also fixed some bugs such as memory issues wrt favorites, WebKit font issues, etc. Please check our release note for details of what changed.
We are also working towards a larger update, so please stay tuned.