In today's culture we tend to rely on technology more than needed. I thought this was a good list of how kids may take advantage of technology and what it is meant to be used for. "Technology is a tool, not a learning outcome.
A New Wonderful Wheel on SAMR and Bloom's Digital Taxonomy ~ Educational Technology and Mobile Learning. This a great quick chart that is color coded and with pictures of the apps that apply to each level of SAMR and Bloom's Digital Taxonomy models.
If you like to give accurate times for your class to complete an activity this extension displays a nice big clock. Even if you browse other sites it keeps counting down until the alarm sounds. https://chrome.google.com/webstore/detail/1-click-timer/igloknlllonknnbkfgggfkigmeegmakf
Stops adverts from playing before you show a video. Particularly useful if you rely on YouTube in Assemblies. https://chrome.google.com/webstore/detail/adblock-for-youtube/cmedhionkhpnakcndndgjdbohmhepckk
Displays the number of unread e-mails you have. https://chrome.google.com/webstore/detail/google-mail-checker/mihcahmgecmbnbcchbopgniflfhgnkff