The reason for the delay is the speed of development which is slower than it was planned, Mozilla stated. Developers are working on the application for over a year, and currently RC (release candidate) version is available. According to the latest information we have, the planned launch date of the final version of the application was the 10th of December, but this has been postponed to end of January.

Firefox for the Modern UI should become available for download on 21st January which is the date when 27th version of this browser will launch.

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