Here is a simple way to hide applications icons from the dock

1. Find the application you want.
2. Right/Control click on the applications name and select ‘View Package Contents’ from the drop down menu that appears
3. In the window appears browse to the ‘Contents’ Folder and open the file named ‘info.plist’ with TextEdit (default)
4. At the bottom of the info.plist file, and the following two lines, and make sure to intent them so they match the rest of the formatting:

<key>NSUIElement</key>

<string>1</string>

Save the file and you are done! To reverse this simple remove those two lines

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