Chrome extensions are right where you need them. When the time comes, it's easy to call up a tool to process what's in front of you the way you need it.
But I'm not partial to a particular developer when there are several options. My favorites are chosen based on how often I use them and how much work they can accomplish (or time saved). For some of the following tasks, the Chrome store has plenty of options.
My suggestion is to read the reviews and do your homework before choosing one over the other. But don't worry if your choice does not work out. There are plenty of others to try.
Here are some of the extensions that I use regularly.
Although I prefer to use a native tool (built into the device), sometimes that's not possible. For example, I used Snagit (discontinued as extension) to clip content and add annotations, etc. Since Snagit is now only available for desktop, I use Nimbus, which also serves as a tab recorder.
2. Link Shortener
URLs can clutter emails and other documents. They're also too long and distracting for most social media platforms, like Twitter. Shortening the link only takes a couple of seconds, and your audience will appreciate the ease of use.
Since I use Google Apps, I chose a link shortener that connects to my account shortening app (goo.gl). It's nice to be able to keep a record of links and access the same link for future use.
3. Tab Recorder
Screencastify is my favorite tab recorder. I use the paid version and enjoy the simplicity of use. It places videos in my Google Drive and allows me to upload directly to YouTube.
If I need a screen recorder with more options and tools, I use Screencast-O-Matic (not an extension). I can blur student data and edit the final video with ease. Plus, I think the quality is much better. But for a quick tutorial or message, the Screencastify extension works great.
My juniors are currently working on a term paper and seem to be having difficulty finding sources. Perhaps they need the process (or organizational strategies) modeled with more depth.
As I search for resources and find good ones, the Google Keep extension allows me to save an article or website and apply a label to stay organized. After four or five sources are collected, I can go back to Keep and click the label to filter the sources I want to evaluate and use to formulate my argument.
5. Insert Learning
Want to insert questions into a webpage or a YouTube video into a Google doc? Insert Learning does those things and more.
Formerly called DocentEdu, Insert Learning is a tool that allows users to insert images, annotations, videos, assessment items, annotated highlights, and discussions into a webpage or published Google Doc. You have to try it to realize its value for classroom teachers.
6. PDF Printer
I use this extension as often as four or five times a week pulling materials from the Internet. It converts a webpage into a PDF and allows users to edit out images or chunks of text and formatting that are unnecessary.
If you need to pull text from the Internet and convert it to a Google doc, open the PDF with the Docs app within Drive (see below).
This is a great tool. It's particularly effective with short videos with excellent content. Only a couple of my students have chosen to try it, so I will use it for explanation videos to model note-taking expectations.
8. Poll Everywhere
I used to add lots of multiple choice questions to Google Slides with the Poll Everywhere extension. My students have enjoyed Kahoot!, Quizlet, and Google forms for multiple choice, so I use Poll Everywhere for the other assessment items.
We use the word cloud generator and the vote up response, and the ranking tool. I particularly like the vote up because students can read through other responses and learn from their peers. We don't do vote down because it's a waste of time. By focusing on the good responses, the expectations become clearer.
9. Drive Slides
This is one of my new favorite tools. It makes a Google Slides presentation out of all of the image files in a Drive folder. It takes about five seconds and saves a lot of time bringing together student contributed content.
Here's a post about some of things my class is doing with Drive Slides.
10. Share to Classroom
The Internet has changed the way we access information, which is why my class does not have a textbook. It does, but we don't consult it exclusively or regularly. The textbook-free classroom, however, is supported by tools like Google Classroom and the extension Share to Classroom.
My favorite feature on this extension is the ability to push content students. With a classroom full of Chromebooks, this becomes a very easy way to manage materials on the fly. Likewise, students can send material to the teacher who can then redistribute it to the students.
Share to Classroom, of course, includes its namesake feature of the ability to share something from the Internet directly to Classroom. This can be done in any of the ways posts can be made to Classroom from within the app.