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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If you have lots of different categories of apps on your dock, spacers help seperate them

execute this command in terminal:

defaults write com.apple.dock persistent-apps -array-add '{tile-data={}; tile-type="spacer-tile";}'
repeat it for each spacer that you want to add, and once you have the desired number of spacers,

killall dock

to make the changes take effects

once the dock has restarted, all of the spacers will reside on the right of the applications side of the dock. Just drag them too where do you want them.

If you want spaces on the right hand side to seperate stacks:
defaults write com.apple.dock persistent-others -array-add '{tile-data={}; tile-type="spacer-tile";}'

and of course…

Killall Dock

here is what my dock looks like…

(click on image to see full size

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You can easily override the default dock magnification setting. Simply hold down Shift-Control while mousing over the Dock, and the override should take effect. If your magnification was previously set to off, the Dock should magnify now. If it was set to on, the Dock should remain the same size when you mouse over it. As soon as you release, Shift-Control, things will go back to normal

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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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