I first met Chris Craft about 10 years ago, either in Atlanta or San Antonio at NECC (now ISTE). Chris is a phenomenally talented educator and you can follow his work on Twitter @crafty184. He is also part of the core team at Ed Tech Team.
Check out all of these extensions here.
Chris has put together a series of chrome extensions that you may find useful. I have tried out the Crafty Text extension, like it and think it's useful. It essentially sits on top of a website and allows you to put up a large overlay- with a url, with directions, etc. If you have ever tried to get all your students in the same place at the same time or to just amplify a point in class- without leaving the site you are showing- this is the extension you need. Install to Chrome: goo.gl/z0alBM
Another extension that I think you may like is Crafty Rights. This forces all Google Image search results to be pre-sorted for copyright restrictions. The search returns images that are labeled for reuse. As you can see below, activate the CR extension, search Google images, and the returned images are labeled for reuse. Can't you just go into search>images>search tools and click on the correct label? Sure- but if you can click once and get there, why bother?
The next crafty extension is the Crafty Level. This returns the Flesch-Kincaid reading level of any web page. After you install it, go to any web page, highlight (select) text and then click the CR icon to see the number displayed.
And finally, last but not least- the Crafty Cursor. This simple tool gives you a translucent yellow bubble over your cursor position. Handy to be able to quickly turn on to highlight a section of a page for a presentation or to help students follow your directions on the board. It's a little laggy on my chromebook- probably because I have too many tabs open.