After a discussion @ UDS-m, the blueprint for UNE default app selection was updated seconds ago and it now points out that some default applications might be changed in Ubuntu Netbook Edition 10.10.

The first on the list is Chromium, which might replace Firefox as the default browser. The blueprint says this will happen if there is enough space for Chromium and it will be used as the default application until Alpha 3 - and then it will be decided if UNE will switch to Chromium by default or not.