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MajorGeeks.Com » Browsers » Browsers - Mozilla Firefox » Firefox Developer Edition 147.0 Beta 3 » Download Now

Firefox Developer Edition 147.0 Beta 3


Author: Mozilla
Date: 12/10/2025
Size: 69-154 MB
License: Open Source
Requires: 11|10|8|7|Linux|macOS
Downloads: 50293 times

tip TIP: Click Here to Repair or
Restore Missing Windows Files
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Rate This Software:
4 (268 votes)



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Firefox Developer Edition features the latest changes and development tools you need to build for the web. Available for Windows, Linux, and Mac.

The beautiful thing about the developer edition is that anyone can use and test it. Of course, you don't want to use this as a daily browser, especially in work situations.

Otherwise, we enjoyed using the new Firefox so much; we might consider switching back.

Firefox Quantum Developer Edition focuses on the new CSS engine designed to be the fastest, most powerful Firefox to date. Of course, since it is the developer version, the features focused on are for developers, including:

● Inspector allows you to inspect and refine code to build pixel-perfect layouts.
● The Console can track CSS, JavaScript, security, and network issues.
● The Debugger is a powerful JavaScript debugger with support for your framework.
● Monitor network requests that can slow or block your site.
● Add, modify and remove cache, cookies, databases, and session data.
● Test sites on emulated devices in your browser.
● Fine-tune animations, alignment, and padding.
● Unblock bottlenecks, streamline processes, optimize assets.
● Find memory leaks and make your application zippy.
● The only developer tool for inspecting the Web Audio API.
● Edit, write, run and execute JavaScript in real-time.
● Edit and manage all your CSS stylesheets in your browser.

If you're not a developer, you might consider using the latest end-user beta instead. It changes frequently, but you can always find it in the most recent Mozilla Firefox release.

Similar:
● How to Make Google Chrome and Mozilla Firefox Run Like New Again
● How to Remove or Edit Saved Credit Card Information in Chrome, Firefox, IE, and Edge
● How to Reset or Repair Google Chrome, Mozilla Firefox or Microsoft Edge
● How to Delete Your YouTube Watch and Search History


Version History for Firefox Developer Edition:
https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases

Editor's Note:
Mozilla discontinued official support for 32-bit Linux; it is now merged into a single link.


Screen Shots Screenshot for Firefox Developer Edition
Official Download Mirror for Firefox Developer Edition Official Download Mirror for Firefox Developer Edition Official Download Mirror for Firefox Developer Edition


Top Downloads In Browsers - Mozilla Firefox

Cyberfox 52.9.1 [ 2018-06-30 04:11:06 | 78.4 MB+ | Freeware | Win 10 / 8 / 7 | 5 ]
Cyberfox Web Browser is a web browser based on Mozilla Firefox with the intent of being fast, stable & reliable.

Tor Browser Bundle 32-Bit 15.0.3 [ 2025-12-09 03:12:19 | 108 MB | Freeware | 11|10|8|7 | 5 ]
Tor Browser Bundle protects your privacy and defends you against network surveillance and traffic analysis. 64-Bit version available here.

Pale Moon 33.9.1 [ 2025-10-21 07:27:19 | 37 MB | Open Source | 11|10|8|7|Linux | 5 ]
Pale Moon is a fast and stable Open Source alternative to the standard Firefox browser.

Waterfox 6.6.6 / 2022.11 Classic [ 2025-12-09 14:18:09 | 72-169 MB | Open Source | 11|10|8|7|Linux|macOS | 5 ]
Waterfox provides you with a high-performance Open Source 64-bit version of Mozilla Firefox. Waterfox Portable via Portapps.io is also available.

Pirate Tor Browser 0.8 (11.0.14) [ 2022-06-08 17:26:40 | 109 MB | Freeware | 11|10|8|7 | 5 ]
Pirate Tor Browser is a bundle package of the Tor client and Firefox Portable browser and custom configs that allow you to circumvent censorship.

« Argente Utilities 3.0.4.1 · Firefox Developer Edition 147.0 Beta 3 · LF Terminal File Manager r40 »


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