There are some apps and extensions that are better blocked in the Google Apps Admin Console to prevent some issues. Here is a list that I recommend blocking.
In the Admin Console, go to Device Management > Chrome > User Settings and then Allowed Apps and Extensions. Select Allow All Apps and Extensions except the Ones I Block and then click Manage. You search the Play store for them and add them to the list.
Another way is to block all apps and extensions except the ones you list as allowed.
Most of the ones listed are ways to get around internet filters.
GoTwitter
Miley Cyrus
Poper Blocker
Miley Cyrus
Facebook Bookmark
VPN.S HTTP Proxy
Proxy Helper
Halo: Reach Theme
Facebook Background Changer
Miley Cyrus We Can't Stop Theme
Browsec
Quick & Dirty Proxy Flipper
Spdy Proxy
Auto Library Proxy Access for WashU
Angry Birds
LibX for Google Chrome (TM)
Falcon Proxy
Proxy-on
ProxyPy Web Proxy
Kick Out Miley
Facebook Double Likes
Miley Cyrus Pictures
CagedMiley Cyrus Twerkn' Everywhere
Miley Cyrus 3.0
Cubic Snake
Hola Better Internet
Fast Proxy
DotVPN - Free and Secure VPN
Proxy List - Free Proxies for everyone
ZenMate Security & Privacy VPN
No Cyrus
Miley Cyrus We Can't Stop
Hola Weather
Proxy Auto Auth
Instagram Bookmark
SocialReviver
Data Compression Proxy
Zalmos SSL Web Proxy for Free
JayProxy
Proxy SwitchySharp
Miley Cyrus 2.0R
nCage
Miley Cyrus
Hiload Web Proxy
Dust Theme for Google Chrome (TM)--