#1 - Pocket

Over 2 500 000 downloads

Technically not web development related, but because you deal with multiple sites at once it is a great tool to bookmark sites and come back to it.

View on Google Chrome

---

#2 - Postman

Over 1 200 000 downloads

Build, test and document your APIs faster. Ideal for those dealing with APIs.

View on Google Chrome

---

#3 - Web Developer

Over 1 000 000 downloads

Adds useful web developer tools to your browser. Think of it as the Swiss army knife for web development.

View on Google Chrome

---

#4 - ColorZilla

Over 800 000 downloads

Advanced eye dropper, color picker, gradient generator and many more features. This is the ant-eater of the internet!

View on Google Chrome

---

#5 - Edit This Cookie

Over 790 000 downloads

The best chrome cookie manager! Add, delete, edit, search, protect and block cookies. Don't just buy the cookies, own the bakery!

View on Google Chrome

---

#6 - Firebug

Over 700 000 downloads

A must have extension which allows you to monitor and edit HTML and CSS on a web page. Saves you more time so you can research what a firebug actually is.

View on Google Chrome

---

#7 - What Font

Over 480 000 downloads

Every wondered what font another website is using? Just hover over the font with your mouse and it will tell you - as simple as that.

View on Google Chrome

---

#8 - Page Ruler

Over 370 000 downloads

Select any area on a webpage and instantly see the sizing of your selected area.

View on Google Chrome

---

#9 - Clear Cache

Over 300 000 downloads

Clear your cache and browsing data with the single click of a button. No popups or opening of a window... Just cache (not cash) cleaning.

View on Google Chrome

---

#10 - Responsive Web Design Tester

Over 130 000 downloads

Quick and easy way to view and test your responsive website across all devices.

View on Google Chrome

---

#11 - Site Spider

Over 4 600 downloads

Handy tool that quickly finds the broken links on your site and also has a feature of editing how Google spiders crawl your site. Be the spider whisperer!

View on Google Chrome

---

#12 - Prototool

Over 900 downloads

Front end development tool to reduce the time spent with CSS by auto reloading and making everything a whole lot easier.

View on Google Chrome