I again point you to a new version of firefox before it becomes official. To download the latest version head over to this ftp directory of mozilla.org. The version installed without problem over 1.5.0.2, all extensions that I have installed are still working.
Versions for Macintosh, Linux and Windows 32 available.
As a reminder, 1.5.0.3 is just a security fix that has been made public in the last days so everything that was scheduled for 1.5.0.3 initially has been moved to 1.5.0.4.
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Thanks man!
Way to jump the gun as 1.5.0.4 is not finished yet.
http://wiki.mozilla.org/Firefox:1.5.0.4:Schedule
Now the finished Firefox 1.5.0.4 is out even though the en_US version is May.8 build date.
http://www.mozilla.com/firefox/releases/1.5.0.4.html in next few hours.
http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/1.5.0.4/