The new browser was originally expected to first appear by the end of this month, but this has now been pushed back until the middle of September.
A posting to the Mozilla development planning group by
Mozilla is still developing new features in the browser and is working to get the size of the code footprint down.
The size of the browser is key to Mozilla, as the streamlined browser takes up far less space than chief rival Internet Explorer.
The final version of Firefox 3.0 was expected by the end of the year. It is not clear whether this will now be pushed back into next year.