Mozilla plans to release four versions of Firefox this year.

No, not the "fourth", namely, "four"! Yes, yes: 4, 5, 6 and 7.

As noted in Softpedia, the Mozilla project has updated its release plan for Firefox versions . The first paragraph sounds exactly like this: “Release Firefox 4, 5, 6 and 7 in 2011”.

In Firefox 5, we plan to add a new account management interface and a simple interface to exchange links with friends, implement animation effects in the interface, and implement support for the 64-bit version of Windows.
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In Firefox 6, developers want to focus on extending the capabilities of web applications, increasing the performance of the cache and JavaScript engine, and also implement support for OS X 10.7.

Plans for Firefox 7 are more vague. It is possible that this version will implement the use of separate processes to display the interface, web content and plug-ins.

But for now Mozilla is still working on Firefox 4, the release of the 11th beta of which is scheduled for this week.