Mozilla, said today that they're forced to delay upcoming Firefox 4, which's on its sixth beta release and will stay in beta until its first RC release which's said to be releasing early 2011, followed by the final release.
Mozilla's Mike Beltzner, said "Based on the delays in completing the 'feature complete' Beta 7 milestone against which our Add-on developers and 3rd-party software developers can develop, as well as considering the amount of work remaining to prepare Firefox 4 for final release, we've revised our beta and release candidate schedule."
The frequent beta releases have been extremely helpful in identifying compatibility issues with existing web content, so we plan on continuing to release beta milestones through the end of December.
The Firefox community was said to have been informed about the circumstance and changes to the schedule were based on feedback. The new schedule was released into public domain.