Mozilla has now confirmed that Beta 12 will be the last beta version of Firefox 4. And here comes one more latest update. Mozilla is aiming to finish Firefox 4 release candidate by February 25. It may available for download by February end.
Mozilla team is all set to release Firefox 4.0 Beta 11 by early next week. And it is extending its beta branch to Beta 12. Maybe Firefox 4 first Release Candidate(RC) will be delayed for few days.