Bon Echo ?

Today, I tried Bon Echo, the alpha release of FireFox 2.0 on OSX. It's unstable and slow ! OK, I know, I shouldn't try alpha release. But I really don't like the new location bar behavior:

• the history drop down menu contains less items than before
•  the history is sorted in a different way
• the back button remove the current item of the history instead of editing the URL

almost unusable for me, I switched back to 1.5 and I'm waiting for the beta.

update: I tried the apha2 today and the location bar bug is fixed. cool !