1
Click "Devices"
2
Click "Chrome"
3
Click "Apps & extensions"
4
Click "Users & browsers"
5
Select the desired OU
6
Click "Add from Chrome Web Store"
7
Click the "Search the store" field.
8
Select the desired Extenstion
9
Click "Select"
10
Click here.
11
Make sure "Allow install" is selected
12
You should now see the extension in the list
