Updated 2019-06-05

Chrome Extensions for Developers

Below is a list of Chrome extensions that I've found to be especially helpful for software development. There's a section for Chrome Extensions by Google, and another section for Chrome Extensions for GitHub.

Developer Extensions

• Clear Cache - A simple extension that clears your browser cache (and optionally history, cookies, etc) with a single click. I use this extension multiple times per day.
• Window Resizer - Emulate other devices/platforms by quickly resizing your screen. Chrome Dev Tools offers this functionality too, but this exension can sometimes be a quicker alternative.
• ColorPick Eyedropper - Quickly identify the Hex code or RGB values of any color on any webpage simply by hovering over it.
• WhatFont - The font equivalent to Colorpicker, this extension allows you to easily identify any font on any webpage simply by hovering over it.
• Crouton Integration - Must-have extension if you have a Chromebook rooted to developer mode and have installed Crouton.
• Code Climate Extension - Deeply integrated into the GitHub UI, from showing CodeClimate stats at the top of each repo, to identifying line-specific issues in PR diffs.
• JSON Viewer - Prettifies minified JSON responses for easy reading.
• bl.ocks.org - Extension from Mike Bostock that "renders" your gists.

By Google

• Chrome Dev Tools Companion - An extension to hep you learn the ins and outs of Chrome Dev Tools.
• Page Analytics - Displays your Google Analytics data in-page on any website where you've installed Google Analytics.
• Google Analytics Debugger - prints useful page stats to the console by automatically enabling the debug version of the GA script.
• Tag Assistant - Ensure that all your various Google tags are installed correctly and functioning properly.
• User-Agent Switcher for Chrome - Does exactly what the name implies. Makes it easy to switch user-agent strings with a single click.

For GitHub

• GitHub Notifier - Shows your GitHub notifications as a Chrome extension badge.
• Refined GitHub - Simplifies the GitHub UI and adds a bunch of useful features.
• Isometric Contributions - Allows you to view your GitHub contributions in an Isometric Graph. Pretty cool and fun!
• OctoLinker - Enables smart navigation between files
• Builds Tab for GitHub - Adds a Builds tab to GitHub
• Contributors on GitHub - Shows information about a user's contributions on GitHub
• GitHub Issue Link Status - Colors issue links by their status
• GitHub Repository Size - Shows the size of a repository along the top of the repo (Next to commits, releases, etc)
• Notifications Preview for GitHub - Shows your notifications on hover
• Wide GitHub - Expands the GitHub interface to the full width of your browser
• Twitter for GitHub - Shows a user's twitter handle in their GitHub profile
• Octo Preview - Shows live markdown previews underneath issues, PRs, comments, etc
• GitHub Hovercard - Name says it all. Enhances tooltips throughout GitHub.

If you're not satisfied with this list, then checkout the AWESOME List of GitHub Extensions