Firefox 3.6, which Mozilla had previously confirmed was to launch this month has been delayed until spring 2010.
The Mozilla wiki has been updated to include "ship Firefox 3.6" as a goal for the first quarter of 2010.
Firefox 3.6 brings minor tweaks and some personalisation tools to the browser and a claimed 25% reduction in start-up time on Windows.
The browser will also bring the potential to take advantage of accelerometers as well as open, native video support.
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Firefox 4.0, which was due to launch in 2010 has also been pushed back – this time to "late 2010 or early 2011," according to the Mozilla wiki. Firefox 4.0 beta will be made available in the summer of 2010.