[ Thanks to kiterunner for this link.
]
“Firefox 4.0 beta 2 pre is now available in silverwave
PPA and it is devoid of any kind of errors, which is unfortunately
the case with ubuntu-mozilla-daily PPA currently. Silverwave PPA
will give you only monthly updates and so instead of getting
swamped by daily updates, you will get the latest Firefox 4.0
releases every month.“What’s New in Firefox 4.0 Beta 2 Pre?
* Tabs are now on top by default on Windows only – OSX and Linux
will be changing when the theme has been modified to support the
change.* Crash protection whenever there is a crash in the Adobe Flash,
Apple Quicktime or Microsoft Silverlight plugins.”