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Here are the steps:

1. download "Mac4Lin" from + or +

2. Extract Mac4Lin

3. click on the Dock and "Delete this Panel" ( Dock is the navigation bar in Desktop footer )

4. Applications -> Add/Remove -> search for "Avant Windows Navigator" and install it

5. Applications -> Accessories -> Avant Windows Navigator

6. on Avant Dock Click on Awn-Manager -> Thema -> add and then give the download Mac4Lin thema from this address:
/Mac4Lin_Install_v1.0/Mac4Lin_Install_v1.0/AWN/

7. go to /Mac4Lin_Install_v1.0/Mac4Lin_Install_v1.0/

8. sudo sh Mac4Lin_Install_v1.0.sh

9. [Optional] change Firefox thema to Mac thema
Here are the videos to help you