Firefox seems to be able to navigate OPDS feeds reasonably well.
Of course you can also use another OPDS compatible ereader app such as Quickreader (which has a free Lite version) - this might be easier. Bluefire (which is also free) is also meant to be about to add OPDS compatibility although it is not working in the currently released version. Other devices have equivalent apps - e.g. Aldiko on Android.