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As Firefox RC1 received a warm response,the developers are aiming to release Firefox 4 on March 22nd.It should have been released with or before Internet Explorer 9 but unfortunately its delayed.IE 9 was released on March 14 ,9 PM PST.
I read an article at Mozilla.dev Planning where Damon Sicore said that there are no known issues in Firefox .which could block release. Both IT and Marketing have indicated that March 22nd is an acceptable date for final launch.But he also said that if Mozilla discovers some new bugs then they would issue an RC2 (Release Candidate 2)
PCPedia would like to wish the Firefox Team good luck and i hope it will be released on the said date.