Internet browser bring some important extensions for web developers and design. Now web developers can save their time and find code bug easily with those Browser Extensions. There are now many browser-based web development tools. By those Extensions web developers can analysis, find errors and solve those easily. Here are the best 20 Browser Extension for professional web development.

1. Web Developer

Web Developer Tool has a lot of functionality for testing web pages. This tool has saved so much time in developing responsive layouts. By using Web Developer Toos, we can see how changes will look on the fly in all the devices sizes that I need to check in very little time. This is just one of the great features there are too many to list. Just install it and begin using it you will wonder how you've worked without it.

Users: 1,076,891 users
Rating: 4.5

2. Handcraft

Handcraft is a web based prototyping tool for interaction designers and front-end developers.It is an app that creates and shares prototype code from your browser. This App is amazing and has many different tools that helped web developers/designers to improve web scripting languages. It has Lovely UI and nice set up. It did not take long to learn its basics features and it had some more advanced things.

Users: 61,848 users
Rating: 4

3. Fire bug

Fire bug uses to Edit HTML and CSS from your browser and view changes in real-time. Firebug integrates with Firefox make web development much easier. We can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page. Now Firefox built-in DevTools are used instead of Fire bug.

Users: 1,827,900 users
Rating: 4

4. IP Address and Domain Information

Checks the IP adress and WHOIS records for the site you are on. It's useful for my workstation. Awesome helper to block all the link spammers of a website by establishing their ip address . Awesome to have, shows you everything you need to know about the site & even someone's own IP info

Users: 130,659 users
Rating: 4.5

5. LiveReload

Real-time page refreshing while editing. This is a good tool for a developer. Provides Chrome browser integration for the official LiveReload apps (Mac & Windows) and third-parties like guard-livereload.

Users: 229,464 users
Rating: 4

6. Form Filler

Form Filler toos can fill all form fields with dummy data. The purpose of this extension is to help developers test their forms quickly and easily.This extension allows you to fill all form inputs (textboxes, textareas, radio buttons, dropdowns, etc.) with random or dummy  data.This extension is a must for developers who work with forms as it avoids the need for manually entering values in fields.
★ Fills all text boxes in a form.
★ Supports the maxlength property.
★  Randomly selects radio buttons dropdown menus and checkboxes.
★ Ignores CAPTCHA, hidden, disabled and readonly fields.
★ Supports generating dummy data based on a regular expression.

Users: 75,430 users
Rating: 4.5

7. Network and Internet tools

Network and Internet tools  this Entension use to troubleshoot site connectivity and look up site information like WHOIS. Network and Internet tools like ping, tracert, domain search, dns blackhole list, dns lookup, domain neighbors and whois information. Their Domain Tools are much better. This opens another tab, and takes you to their webpage. The other opens a 'little' window in the same tab, and displays the information right there.Outstanding design. We can check an IP without having to open a new browser instance. Great for webmasters, and all right from the Chrome Browser. 

Users: 37,997 users
Rating: 4

8. MeasureIt! 

MeasureIt! is used to measure the pixel width and height of anything on a web page. Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.

Users: 101,415 users
Rating: 2.5

9. Lorem Ipsum generates

In Web Development, it is an importance tool to generate dummy text for test. The classic Lorem Ipsum pig-latin text that you can use as web page filler for testing web page layout. Provides an elegant and quick way to create default text or generate Lorem Ipsum. Optimized for quick usage, but it can customized.The Lorem Ipsum Generator quickly delivers default text to complement your amazing design. The default settings are optimized to be used right after installation, but you can easily customize a few settings to get the perfect text for your taste. Each sentence is randomly generated to simulate real text.

Users: 28,249 users
Rating: 4.5

10. ColorZilla

ColorZilla, one of the most popular Firefox developer extensions with over 5 million downloads is finally available for Chrome! With ColorZilla you can get a color reading from any point in your browser, quickly adjust this color and paste it into another program. ColorZilla is similar to Eyedropper, but also generates color gradients.
★ Eyedropper - get the color of any pixel on the page
★ Advanced Color Picker (similar to Photoshop's)
★ Ultimate CSS Gradient Generator
★ Webpage Color Analyzer - get a color palette for any site
★ Palette Viewer with 7 pre-installed palettes
★ Color History of recently picked colors
★ Displays element information like tag name, class, id, size etc.
★ Auto copy picked colors to clipboard
★ Keyboard shortcuts 
★ Get colors of dynamic hover elements 
★ Single-click to start color picking (currently only on Windows) 
★ Pick colors from Flash objects
★ Pick colors at any zoom level

Users: 1,216,178 users
Rating: 4.5

11. Stylish

Stylish can customize any webpage to your own color scheme in 1 click, thousands of user styles with beautiful themes, skins & free backgrounds. This extension lets you override standard web page CSS to test color schemes on your webpage and others. Eye Dropper makes it easy to pick exact colors from web pages and saves your color history
★  Give Reddit a dark mode, use a minimalist Facebook, or change the look of Google, Twitter, and any of your favorite sites
★  Customize backgrounds, color schemes, fonts and even animations
★  Easily disable, enable, edit or delete any of your installed themes
★  Create your own user styles (themes) using Stylish’s CSS editor, and share it with millions of Stylish users

Users: 1,654,418 users
Rating: 4.5

12. WhatFont

The easiest way to identify fonts on web pages. By using this extension, you could inspect web fonts by just hovering on them. It is that simple and elegant. WhatFont allows web developers to save time by showing, what font and size a specific word on a web page is, instead of googling or searching a list of fonts that look like it. It also detects the services used for serving the web fonts. Supports Typekit and Google Font API. WhatFont is a simple and elegant extension and very useful for web development.

Users: 756,364 users
Rating: 4

13. Google Font Previewer 

Google Font Previewer allows you to select a font from the Google Font directory with a few text styling options, and preview them on the current tab. Google Font Previewer lets you choose a font from the Google Font API directory, and apply that font to the whole page or a specified CSS selector to see how it looks. Useful when you're designing a website and want to quickly find a font that will look good. If you always use the same fonts, you can star them for quick access.

Users: 25,474 users
Rating: 4

14. Awesome Screenshot

Awesome Screenshot extension capture a portion of the current screen and edit or save the resulting image to disk. Screencast, record screen as video. Screen capture for full page, annoate, blur sensitive info, and share with one-click uploads. Awesome Screenshot lets you capture your screen and annotate with arrows and text. Capture all or part of any web page. Add annotations, comments, blur sensitive info, and share with one-click uploads. Now with free desktop capture!
The default option for saving an image is now storing the image on 
★ Capture or clip selected area, or all visible portion, or entire page
 ★ Supports PNG format
★ Supports horizontal scrolling when capturing 
 ★ Desktop screen capture
 Annotate & Edit
 ★ Annotate any image with rectangles, circles, arrows, lines and text
 ★ Crop, scroll & show crop area dimensions
★ Blur certain sections to hide sensitive information
 ★ Copy the screenshot and paste it to Gmail, Facebook, Twitter, etc. Supports Windows and Linux
 Save & Share
★ Save to local
★ One-click to upload to awesomescreenshot.com and get a shareable link
★ Support for Google Drive (Gdrive)
★ Save very large images, bypass the 2M limit. No more crashes

Users: 2M users
Rating: 4.5

15. Resolution Test. 

Resolution extension help web developer to view page from different resolutions. An extension for developers to test web pages in different screen resolutions, even it has an option to define your own resolutions. It includes a list of commonly used resolutions and the ability to customise that list.

Users: 155,865 users
Rating: 4

16. Browserling

Browserling - Cross-browser testing, checks site compatibility issues for different browsers.There are many different browsers and operating systems and Browserling provides quick access to all the most popular browsers on the most popular operating systems.Browserling is a live interactive cross-browser testing service that provides effortless cross-browser testing for web developers and web designers.

Users: 5,651 users
Rating: 3

17. Last pass

LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device. Last pass extension manage multiple passwords using a single master password and will automatically log you into saved pages. Also can create profiles which you can use to auto-fill forms and registration pages. It is common for Web developers and designers to subscribe  many web services and tools to do their job. Thus, they have a ton of passwords, which can be especially hard to track if you are creating a unique password for each account.
★  Generate secure passwords to replace weak ones
★  Create new passwords as you sign up for sites
★  Protect your LastPass account with multifactor authentication
★  Use the LastPass security check to review your passwords and  flag weak and duplicate passwords

Users: 5,682,660 users
Rating: 4.5

18. Websecurify

Websecurify is used to test whether website vulnerabilitiesn or not. The Websecurify Suite is a cloud-based web application security solution with emphasis on client-side technologies. Websecurify Suite is a collection of web application security tools available from inside your browser. The Suite is easy to use, fast, efficient, reliable and always available.
★ Exportable reports
★  Integration with 3rd-party tools
★  Automated and manual testing capabilities
★  Instantaneous updates
★  The full and complete testing engine
★ Fully configurable
★  Flexible, hassle-free
★  Can test OWASP TOP 10 and WASC

Users: 18,774 users
Rating: 3

19. Too Many Tabs 

Manage your tabs, improve your browsing, and maintain your sanity when you have many tabs open. Ever tried having 20 tabs or more open in Chrome? You can't even see the favicon of the tabs, not to mention the tab titles! If that happens to you, TooManyTabs is a must-have extension that manages your tabs, reduces your tab overflow, and saves your sanity!
Too Many Tabs  enhances Chrome to allow you to efficiently manage a large amount of tabs. 
★ Bird's eye view of all opened tabs
★ Clear preview of each tab's content 
★ Instant tab search
★ Sort tabs by creation time, domain or title
★ Restore recently closed tabs
★ Suspend idle tabs and save memory, organize with custom columns
★ Custom themes

Users: 276,715 users
Rating: 4

20. DoNotTrack

Do Not Track is a technology and policy proposal that enables users to opt out of tracking by websites they do not visit, including analytics services, advertising networks, and social platforms.  Do Not Track prevents online tracking scripts from running and helps keep your browsing history private. At present few of these third parties offer a reliable tracking opt out, and tools for blocking them are neither user-friendly nor comprehensive. Much like the popular Do Not Call registry, Do Not Track provides users with a single, simple, persistent choice to opt out of third-party web tracking. 

Users: 55,935 users
Rating: 4.5