This is no longer a problem. Help-> Release Notes now points to http
://en-us.www.mozilla.com/en-US/firefox/2.0.0.1/releasenotes/ on Feisty
and to the appropriate Ubuntu pages on dapper/edgy.
** Changed in: firefox (Ubuntu)
Status: Needs Info => Rejected
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Bad release notes URL
https://launchpad.net/bugs/47485