Google Dictionary allows you to look up a word on any webpage quickly.
Too Many Tabs
Too Many Tabs allows you to manage your tabs. Can make tabs ‘idle’ and view how many tabs are open.
One Tab is similar to Too Many Tabs. With one click, all your tabs are condensed into one list with hyperlinks.
Adblock blocks ads on webpages thus optimizing your browsing experience.
Goo.gl is a Google URL shortener. It also creates a QR Code for the webpage.
Diigo allows you to archive, annotate, and bookmark any webpage. Diigo is accessible from anywhere.
Feedly is my favorite RSS Reader. I can easily follow new posts on my favorite blogs.
CollorZilla identifies any color on any webpage; gives the hex code and keeps a history of identified colors.
Move It is a fun extension. You set the intervals at which an exercise challenge will appear on your screen.
Add This is a new favorite of mine. Have you ever stumbled across a great website that you wanted to share? Then you needed to copy and paste the link to Facebook, GMail, Twitter, or where ever. Skip that with Add This. Automatically lets you share a site to the media of your choice.
Clearly cleans up posts, blogs, and articles. Read without the clutter.
WhatFont can identify any font on any website. Great for design purposes, or the curious.