Mozilla Firefox Beta for Windows

Used Mozilla Firefox Beta for Windows?

Beta or prerelease software is not intended for inexperienced users, as the software may contain bugs or may potentially damage your system. We strongly recommend that users exercise caution and save all mission-critical data before installing or using this software.

Editors’ Review

Download.com staffFebruary 25, 2026

Firefox Beta lets you test upcoming browsing features. Your feedback helps refine performance and functionality for future releases, ensuring a better experience for all.

Pros
- Test cutting-edge browsing features early
- Contribute to performance improvements
- Influence future Firefox functionality
- Receive regular updates
- Directly impact development through feedback
Cons
- Features may be unstable
- May contain bugs
- Not intended for general use
- Requires active user feedback

Mozilla Firefox Beta for Windows

Used Mozilla Firefox Beta for Windows?

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Full Specifications

GENERAL

Release: February 1, 2021

Latest update: February 25, 2026

Version: 86.0b4

OPERATING SYSTEMS

Platform: Windows

Operating System

Windows 7
Windows 8
Windows 10

Additional Requirements: None

POPULARITY

Total Downloads: 2,297,882

Downloads Last Week: 3

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Last Updated

User Reviews

3.7/5

656 User Votes

SLOW & CRASHING!
XmarksCRAPSeptember 23, 2015
Pros
None whatsoever
Cons
Mozilla continuous to stick our computers with their exuberant display of uselessness. Every new version is SLOWER than the previous one and CRASHES MORE and more often. This is pretty close to RAPE, and if we don't take it, they don't support it. One day, after a multi million dollar lawsuit that puts one of these retarded software companies out of business, it will be ILLEGAL to force user to upload the latest updates.
Summary
SLOW AND CRASHY!!!
My advice: Don't download this version
rduffey2November 6, 2014
Pros
None that I can think of!
Cons
I loved the original version of firefox, but this new version is nothing but a pain! Most of the time I can't access the internet and get the message that the proxy server is not connected; I've never used a proxy server before, and comcast my internet provider tried to help me reset the settings so the proxy is disabled, every time we did it would revert back to the proxy server. I'm sorry I ever used fire fox now!
Summary
If you want your computer to go "CRAZY" download this version of fire fox....This really sucks!
Bing Bong! Microsoft calling!
seankilkennySeptember 15, 2014
Pros
Quick and comfortable to use. Still pretty secure, despite getting a larger share of browser market.
Cons
Time was, you could customise and configure Firefox to our heart's content. These days, Mozilla have unilaterally decided to install Bing as the 'Default' search engine - with no means to amend, adjust or replace it.
Summary
Might still be good, but taking the choice from the user will never win you votes.
too many openings to let in malware
snooky796December 1, 2013
Pros
nothing I can think of
Cons
I had to redo everything on my computer,pop up blocker, ect..everything went wrong with this update..I'm still working on getting some things back to normal. I am still high jacked on search engine no matter how many times I have changed and deleted the ones added.
Summary
it took me days to fix and get it running right again. very disappointed with this update
Many questions to resolve
werdonmorrisAugust 19, 2013
Pros
Very easy to use, and self explains if the user has a problem, and can submit a problem order.
Cons
Has a very nasty habit of not responding after watching Netflix.
Summary
I have used Mozilla since 1999, and will continue to do such.
Better than previous one.
ivanfilipp13March 31, 2013
Pros
More compatible, effective, very quick.
Cons
- better - faster - quicker - smarter
Summary
At least better for using as IE7.
Like all Firefox it is great w/minor problems
retfiremedicMarch 19, 2013
Pros
Fast easy to use,great graphics and speed,Loads of add on's
Cons
For some reason every day two or three times it will stall and say (Firefox not responding) ?
Summary
I love it if the stalling could get fixed
Works flawlessly
yourname1999February 10, 2013
Pros
Says what it does, does what it says.
Cons
None that I know.
Summary
Great software.
tlredd54January 13, 2013
Pros
Easy to use and surf online.
Cons
Have not found any yet.
Summary
This is my number 1 browser
Primo888December 22, 2012
Pros
it's the fastest
Cons
no problems at this time
Summary
I am still looking for a faster one

Developer’s Description

Test about-to-be-released browsing features and contribute to putting the finishing touches on performance and functionality.

Firefox Beta includes dozens of major features and improvements - by testing them early we'll be able to respond to your feedback for future versions of Firefox. Once you download Firefox, you're part of our Beta program and will receive regular updates as more features launch.Mozilla Firefox Beta is in the Web Browsers category of the Browsers section.