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The Best Firefox Extensions for Developers

By Riki-Leigh Jones3rd March 2025

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QualityHive Blog

Mozilla Firefox is a popular browser platform amongst web designers and developers, offering many powerful tools to help speed up workflows. 

With so many browsers available, staying ahead of the curve takes a lot of work. One of the key factors that make Firefox so well-liked is its library of extensions that improve your browsing experience and simplify the work of web developers. 

With Firefox extensions, your web development team can add helpful features to your browser to save time and make work more efficient.

In this article, we’ll cover the best Firefox extensions for developers and designers. With the help of these extensions, you’ll be able to boost your team’s productivity and streamline your workflows, so you can code with ease. 

1. QualityHive

Topping this list of the best Firefox extensions for developers is QualityHive, which you can use to simplify bug tracking and more easily collaborate with people inside and outside of your team. 

With QualityHive, instead of sending messages back and forth, your web development team can instantly capture videos or screenshots to clearly convey the issue at hand. The tool’s built-in annotation tool further streamlines the feedback process to reduce confusion. 

QualityHive also logs JavaScript errors directly within tasks, so web developers can troubleshoot them more quickly. QualityHive is one of the best Firefox extensions for developers as it allows your team to spend less time identifying problems and makes it easy to resolve them faster, streamlining the web development process. 

2. WebIDE

WebIDE is a browser extension that offers a range of tools for web designers and developers. This extension allows users to edit websites offline, view and debug HTML, CSS, and JavaScript code, and see which elements are used most often on a page. 

WebIDE is a helpful extension that can save web development agencies time when working on a project and is widely considered one of the best Firefox browser extensions for developers. 

3. HTTPS Everywhere

HTTPS Everywhere is a Firefox extension that allows you to use HTTPS when you’re browsing the web. It provides a helpful security feature that protects your data and ensures your online transactions are secure. 

HTTPS Everywhere redirects you to the secure version of a website whenever possible, reducing the risk of data interception. 

4. Colorzilla

Colorzilla is a Firefox browser extension that allows you to quickly view the colours of any web page. This tool is helpful for web designers as it allows them to work on colour selection more productively on their website designs. 

Colorzilla’s features include a colour picker, gradient generator, and the ability to copy colours in various formats. Whether you want to match brand colours or refine UI elements, Colorzilla simplifies the process. 

5. Firebug

Another popular tool on our list of the best Firefox extensions for developers is Firebug. This extension allows you to inspect, debug, and diagnose various web pages and troubleshoot website issues. 

Firebug gives web developers more insight into how their pages function with the help of real-time editing, network monitoring, and CSS inspection. It’s an essential tool for debugging JavaScript errors and ensuring the websites you’re building work smoothly.

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6. Cookie Manager

Cookie Manager is an extension for Firefox that helps you manage your cookies and track the data stored within them. 

This extension lets developers inspect, edit, or delete cookies when testing their web applications. It also helps you understand how cookies behave across different pages.

7. Page Performance Test

Page Performance Test is a Firefox extension that allows you to measure the performance of your websites. 

This tool is one of the best Firefox extensions for developers as it helps you easily identify and fix issues relating to website speed.

8. FireFTP

FireFTP allows users to easily upload files to their website directly from their browser, via FTP (File Transfer Protocol)

This browser extension is especially useful for web developers who frequently update website files as it allows you to easily upload, download, and manage files on remote servers.

9. Ghostery

Ghostery is a helpful add-on that displays installed trackers and pixels of any website. 

This tool helps you find and analyse the marketing and tech stack of any website you want. It also lets you block them if you don’t want your session to be recorded. 

10. CSSViewer

Last but not least on our list of the best Firefox extensions for developers, CSSViewer is a browser extension that assists you when troubleshooting a CSS issue or creating new styles.

The tool’s live preview feature allows you to see how your changes will look in real time, making it a helpful tool.

Choose QualityHive To Optimise the Website Development Process

Here, we’ve covered some of the best Firefox extensions for developers and designers. The ones we’ve listed in this guide are just a few of our favourites, but there are many other helpful extensions available that can meet your needs, so it’s worth taking the time to explore them all. 

QualityHive is a website feedback and task management tool that allows web developer agencies and teams to build web projects more efficiently. It lets you share insightful feedback, track task progress, and save countless hours of development time per project. With QualityHive, you can create exceptional digital products. 

We offer different plans to effectively cater to teams of all sizes and boost your productivity. 

Learn more about our features here, and book a demo with QualityHive today.

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