gnome-shell extension support issue [closed]

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http://askubuntu.com – I have just upgrade gnome-shell 3.0 to 3.3.9 and surprised. Almost no gnome-shell extension are not supporting. I find few in the internet which support new gnome-shell. ?????????WHY???????? One of the most important condition of software developing(Engineering) is to support the previous version as much as possible. Why are gnome-shell developers doing this? What is the feature of the huge number of extension had already developed? (HowTos)