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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You can make the dock icons for all apps appear transparent when it is hidden/

Lauch Terminal and type in the following command:

defaults write com.apple.Dock showhidden -bool YES

followed by

Killall Dock
now you should be good to go
to test it, hide an app

Now When you hide an app (firefox in this case) its icon is transparent

this is very use full to tell which apps are hidden vs just open in the background or in other spaces

if you wish to reverse the trick:

defaults write com.apple.Dock showhidden -bool NO


followed by

Killall Dock

Now its back to normal

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