Re: what is the difference between Firefox and Firefox Beta?
Mozilla Firefox has no 4 channels:
Firefox Nightly - the one that is worked on and the one that gather patches. (Firefox 13).
Firefox Aurora - more stable, features are worked on (Firefox 12).
Firefox Beta - includes (Firefox 11) all that was stable at the end of January .
Firefox Release - final version, stable sent out. (Firefox 10) .
After the beta build is tested and is signed off goes to release Firefox
For users it is best to instal Firefox. If you want to Contribute to Mozilla, Install Beta and play with it.