Firefox 143: Should You Install Web Apps Again?

• 🔄 Firefox 143 brings back installable web apps for Windows, showing new support for PWAs.
• 💻 New tab management features make multi-window work better and help developers get more done.
• 🔒 Better media permissions in Firefox 143 offer simpler user control and meet security rules.
• 🧩 Developers can now get closer to Chromium-based browsers for putting out non-native apps.
• 🧪 Privacy and fingerprinting blocking improvements make Firefox 143 good for privacy-first applications.

Firefox 143 is a big step for Mozilla's developer community. It brings back installable web apps (PWAs). It also makes privacy and security better, and improves tools that help people get work done. Whether you test multi-device builds, make internal dashboards, or build apps for customers, the latest Firefox update offers a stronger, developer-focused place. It's worth looking at again.

Firefox 143: A Quick Look at the Update

Firefox keeps going with a set four-week release cycle. This shows Mozilla’s promise to make small but important changes. Firefox 143 is the same. It shows Mozilla's new focus on features developers care about. This release is not just another update. It brings new ways of working for app-like experiences. It also improves development tools and makes how it works with the operating system better. These changes will directly change the web development process.

And, from a simpler browser interface to faster behind-the-scenes work, version 143 sets a clear path for more professional web developers to use it. Let's look closer at why this Firefox update—and its brought-back install web apps feature—is important.

Installable Web Apps Are Back

A Short History of PWAs in Firefox

Progressive Web Apps (PWAs) have helped connect fully native apps and regular web pages for a long time. They offer a special way for developers to put out web-based software that feels almost like native apps. Mozilla once had this feature but took it out in Firefox 112. They said few people used it and it was hard to keep the code working across operating systems. But, many developers and users were upset about this choice.

People pushed back for good reason. Many smaller tech teams and big companies use PWAs to put out apps in many places. They do this without building separate apps for each platform.

What's Back in Firefox 143

With Firefox 143, Mozilla has brought back support for installable web apps. For now, this is on Windows only, but Linux support will come in a later update. This brings back a new promise to give developers modern tools. They will not need to use only Chromium browsers.

The installable PWA experience now works like it does in Chrome or Edge. Sites ready to install show an icon in the address bar. When installed, they open in separate windows with their own shortcuts on the desktop or taskbar.

By bringing back this feature, Mozilla makes Firefox more than just a web browser. It becomes a complete platform for putting out apps.

Why Developers Should Care About PWAs in Firefox

Apps now go beyond app stores and native compilers, so PWAs are becoming very important. Here's why putting PWA features back in Firefox is a big change for developers:

1. Put Out Apps Everywhere Without Native Builds

PWAs let web developers create installable apps without dealing with all the steps for App Store or Play Store approval. Everything is sent over HTTPS. And, how development work is done feels more like putting out websites than making install files.

With Firefox 143, you get back the ability to make, check, and send out installable apps on the open web. This avoids problems with putting out native apps.

2. Better Offline Support

PWAs use Service Workers—these are scripts that run in the background to save content and handle background tasks. This lets apps work offline or with slow internet. Firefox supports these Service Workers, letting developers make apps that still work even when the internet connection is not good.

This makes Firefox a strong testing browser for very important apps or mobile-first apps that often lose internet connection.

3. App-Like Feel for Better User Use

Firefox's updated PWA installation process opens web apps in a separate window. It does this without the usual browser parts (like tabs, URL bar). This makes the experience better and matches what users expect for ease of use in native apps.

Developers making dashboards, data entry tools, or anything that needs users to focus for a long time will get something good from this clean look.

4. A More Open System

Chrome is tied closely to Google services. Firefox, though, offers a platform that respects privacy more. This is good for developers building special, rule-bound, or sensitive apps. Think healthcare, HR, or internal tools.

How to Install Web Apps in Firefox 143

Installing web apps is now easier than ever. Firefox's latest version makes it even smoother for Windows users.

How to Install PWAs in Firefox 143: Step-by-Step:

1. Open a PWA-Ready Website: Sites like Twitter Lite, Spotify Web, or your own app with a service worker will work.
2. Look for the Install Icon: This is usually shown as a "+" or monitor symbol in the URL/address bar.
3. Click the Install Prompt: You will be asked to confirm the install. Once you say yes, the app opens in its own window.
4. Find the Shortcut: On Windows, the new app will show up on your desktop or taskbar.
5. Manage in Browser Settings: You can manage and remove installed apps through about:apps.

Keep in mind that Linux support is being worked on. But Mozilla has said it plans to release this soon.

Tech Notes for Developers

If you build a PWA, make sure it follows these rules to work with Firefox:

• HTTPS domain
• Good JSON manifest (manifest.json)
• Service workers set up right
• Icons for many sizes

Developers should test on both Chromium and Firefox. This helps find differences in the user interface and features, like offline caching or background sync. These are still less developed in Firefox than Chrome.

Tab Management Upgrades That Boost Productivity

Firefox 143 brings new ways for tabs to work. These are meant to make things work better for multi-instance setups.

Main Improvements:

• Better Drag-and-Drop: Moving tabs between many browser windows and monitors is smoother. There are clear drag indicators that make it clear where things go.
• Better Right-Click Menus: Tab menus now put frequently-used options first. These include “Close Tab,” “Move to Window,” and “Mute.”
• Better for Accessibility Rules: Keyboard use and screen reader labels are better for tabs. This helps both daily users and developers checking UI accessibility.

This is very helpful for comparing native vs. PWA views side by side. It also helps organize testing setups across many screens.

More Secure Camera Access Controls

Webcam and microphone access have been a worry for a long time. This is true for privacy and how easy they are to use. Firefox 143 brings better ways to ask for permission to simplify these processes.

Important Improvements:

• Multi-Device Selection Prompts: If you have many cameras or mics, Firefox offers easier choices.
• Take Back Access Easily: Users now have simpler ways to take back camera or mic permissions. They can do this through browser settings or while using an app.
• Always Keeping Consent: For apps used a long time (like conference tools), Firefox now keeps track of and applies consent in the same way across different times you use them.

Apps based on WebRTC, voice identifying tools, and video interview platforms can now give users easier setup. And they can make sure of following data rules.

Privacy and Tracker Blocking Improvements

Mozilla continues to lead in privacy for users. Firefox 143 improves tracking prevention and fingerprint blocking in several important ways.

What's New?

• Better Fingerprint Blocking: Small browser details, like screen resolution, time zones, and fonts, are now more anonymous under Enhanced Tracking Protection (ETP).
• Clearer UI for Permissions: Small permission info boxes now show clear on/off switches. This makes things clearer for users instead of having hidden settings.
• Better Ways to Stop Ads: Anti-tracker actions have become smarter. They hide unneeded trackers without breaking ads that should work.

Developers making analytics tools, custom CRMs, or advertising interfaces should check closely how Firefox 143 handles and possibly blocks scripts or page parts.

Performance and Platform Enhancements

Firefox 143 has more than just visual updates and install features. It also includes changes to how the system works. These are meant to make general web apps work better.

Main Behind-the-Scenes Boosts:

• Faster JavaScript Work: Mozilla’s SpiderMonkey engine now compiles and runs JS code faster on newer hardware. This is thanks to better JIT compilation methods.
• Lower CPU & RAM Use: Apps that use a lot of power—like games or interactive dashboards—will run smoother and use less memory.
• Better DevTools: Small interface changes to the Console, Debugger, and Inspector make finding errors and working with the DOM easier.

For teams using Electron, NW.js, or isolated setups, this faster work can lead to important improvements in how stable things run.

Is Firefox Catching Up on Web Compatibility?

Firefox has often been slower than Chromium in supporting the newest APIs. But it is making progress.

APIs and Standards That Now Meet Rules or Are Almost Done:

• Date and Time Inputs: Calendar pickers and controls make the user experience better for apps with many forms.
• Web Components and Shadow DOM: Support is good enough for use in complicated single-page apps.
• Better Media and Permissions APIs: These now match well with WebRTC and HTML5 standards.

Developers should keep testing on Safari and Chromium browsers to test everywhere. But, Firefox 143 can work well for most production-ready PWAs.

Why It’s Worth Revisiting Firefox for Dev Work

The browser world is getting more focused on Chromium. Firefox gives a needed balance. And with this version, it's a real choice again.

Good Times to Use for Development:

• Healthcare/Finance Apps: Firefox’s deep privacy features fit well with HIPAA/GDPR rules.
• Internal Company Tools: Put intranet apps as installable PWAs on employee devices. There is no external store or IT control needed.
• Cross-Browser Testing: Have fewer surprises by checking on a non-Chromium way of showing things.

The ability to install web apps directly now makes Firefox fit better with how apps are put out in the real world.

Dev-Centric Use Cases to Explore

Here are useful projects where Firefox 143 can do well:

• Documentation Portals: Make design systems or internal wikis into installable, stable apps.
• API Testing Dashboards: Easily set up localhost project UIs and test them as if they were native.
• Client Sandboxes: Give installable, separate demo setups for client testing without sending code outside.

And, developers can now test how installs work for internal tools. There is no risk that comes from only using Chrome for development.

Stay Updated: Firefox’s Dev-Focused Channels

To keep making your development ways of working better:

• 🔧 Nightly: Get new features fast. This is good for people who use new APIs early.
• 🔍 Beta: Check how stable it is before your users do.
• 🛡️ ESR (Extended Support Release): This is perfect for releases for whole companies. Here, being steady is more important than the newest features.

Use these channels with test tools. Use automated tools like Selenium or Playwright to make sure it works well with browsers.

How to Upgrade to Firefox 143

To use new features:

On Windows/macOS:

• Go to Settings -> General -> Firefox Updates -> Check for Updates.

On Linux:

• Use package managers like apt or dnf. Or get direct downloads from mozilla.org.

For safer, longer releases—especially in company networks—think about using Firefox ESR releases.

Should You Reconsider Firefox as a Dev Tool?

Yes. Installable web apps are back. It also has better DevTools, media handling that puts security first, and changing web standards support. Firefox 143 should be part of your development and testing set of tools again.

You might prepare installations for big companies. Or isolated setups. Or tools for customers where privacy and portability are important. In all these cases, Firefox now lets you build modern web apps with confidence. And you will not need to only use Chromium.

Citations

Mozilla. (2024). Firefox 143.0 Release Notes. Retrieved from https://www.mozilla.org/en-US/firefox/143.0/releasenotes/