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Releases
6.5.0
6.5.0 Beta 1
6.5.0 Beta 2
6.5.0 Beta 3
6.5.1
6.5.2
6.5.3
6.5.4
G4.0.0
G4.0.0.1
G4.0.1
G4.0.2
G4.0.2.1
G4.0.3
G4.0.3.1
G4.0.4
G4.0.5
G4.0.5.1
G4.0.6
G4.0.7
G4.0.8
G4.1.0
G4.1.1
G4.1.1.1
G4.1.2
G4.1.2.1
G4.1.3
G4.1.3.1
G4.1.3.2
G4.1.4
G4.1.5
G5.0
G5.0.1
G5.0.2
G5.0 Beta 1
G5.0 Beta 2
G5.0 Beta 3
G5.0 Beta 4
G5.0 Beta 5
G5.1
G5.1.1
G5.1.10
G5.1.11
G5.1.12
G5.1.13
G5.1.2
G5.1.3
G5.1.4
G5.1.5
G5.1.6
G5.1.7
G5.1.8
G5.1.9
G6.0
G6.0.1
G6.0.10
G6.0.11
G6.0.12
G6.0.13
G6.0.14
G6.0.15
G6.0.16
G6.0.17
G6.0.18
G6.0.19
G6.0.2
G6.0.20
G6.0.3
G6.0.4
G6.0.5
G6.0.6
G6.0.7
G6.0.8
G6.0.9
G6.0 Beta 1
G6.0 Beta 2
G6.0 Beta 3
G6.0 Beta 4
G6.0 Beta 5
Support
Advanced and experimental features
Configuration Editor for Waterfox
Waterfox advanced customization and configuration options
Waterfox’s protection against fingerprinting
How to enable Windows SSO login in Waterfox
Android
Common Myths about Private Browsing
Manage my default search engines in Waterfox for Android
Enhanced Tracking Protection in Waterfox for Android
Searching with Waterfox for Android
How to set up Sync in Waterfox for Android
HTTPS-Only Mode in Waterfox for Android
Grant camera access to Waterfox for Android
Scan QR codes in Waterfox for Android
Set Waterfox for Android as the default browser
Basic browsing
Address bar autocomplete suggestions in Waterfox
Manage file types and download actions in Waterfox
Customize items on your Waterfox New Tab page
Customize your New Tab page to hide or display content
How to set the home page
Mute sound in Waterfox tabs
Print simplified, clutter-free pages in Waterfox
Web Push notifications in Waterfox
Search suggestions in Waterfox
Take screenshots on Waterfox
Waterfox Reader View for clutter-free web pages
Bookmarks and tabs
About the New Tab page
Use bookmark folders to organize your bookmarks
Can’t add, change or save bookmarks - How to fix
Export bookmarks to Safari
Export Waterfox bookmarks to an HTML file to back up or transfer bookmarks
Import Bookmarks from an HTML file
Recover lost or missing Bookmarks
How to use Waterfox
How to generate a secure password in Waterfox
Tips and tricks
Waterfox Page Info window
Customize controls,...
Customize Waterfox with...
Use extensions to add features to Waterfox
How to update add-ons
Why is there an OpenH264 plugin in Waterfox?
Bookmark options
Remove the Other Bookmarks folder from the Bookmarks Toolbar
Tab settings
Tab preferences and settings
Waterfox options,...
Download, install and migration
Back up and restore information in Waterfox profiles
Find what version of Waterfox you are using
Importing Safari data into Waterfox
Install an older version of Waterfox
Install Waterfox on Linux
Profiles - Where Waterfox stores your bookmarks, passwords and other user data
Recovering important data from an old profile
Update Waterfox to the latest release
Copy your personal...
Export login data from Waterfox
Fix slowness, crashing,...
Certificate Pinning Reports
How to troubleshoot security error codes on secure websites
Fix printing problems in Waterfox
Fix video and audio problems on Waterfox for Windows N editions
Home page with pipe character opens extra tabs when Waterfox starts
How to reset the default user agent on Waterfox
How to run Waterfox when your profile is missing or inaccessible
Reset your Primary Password if you’ve forgotten it
What to do when searches take you to the wrong search website
Task Manager - see what tabs or extensions are slowing down Waterfox
Use the Troubleshooting Information page to help fix Waterfox issues
Waterfox keeps crashing at startup
Waterfox repeatedly opens empty tabs or windows after you click on a link
Waterfox is stuck in Troubleshoot Mode
Wrong home page opens when I start Waterfox - How to fix
Website will not allow Waterfox to display the page if another site has embedded it
Waterfox crashes
Waterfox won’t start - find solutions
Error messages: what they...
How to fix the Update Failed error message when updating Waterfox
Warning Unresponsive script - What it means and how to fix it
"Waterfox is already running but is not responding" error - How to fix
Waterfox says it’s just updated every time it starts - how to fix
What do the security warning codes mean?
Problems with add-ons,...
Unable to install add-ons (extensions or themes)
Upgrade your graphics drivers to use hardware acceleration and WebGL
Procedures to diagnose and...
Diagnose Waterfox issues using Troubleshoot Mode
Reset Waterfox preferences to troubleshoot and fix problems
Troubleshoot extensions, themes and hardware acceleration issues to solve common Waterfox problems
Troubleshoot Waterfox issues caused by malware
Troubleshoot and diagnose Waterfox problems
Waterfox is slow or stops working
Waterfox hangs or is not responding - How to fix
Waterfox uses too much memory or CPU resources - How to fix
Unblock Waterfox from...
Captive portal detection
Configure Windows Firewall to allow Waterfox access to the Internet
Server Not Found - Troubleshoot connection problems
Videos, sound, pictures...
Fix common audio and video issues
Fix problems that cause images to not show
What to do if Waterfox won’t play any sounds
Waterfox won't save...
What to do if you can’t download or save files
Changes to toolbars and window sizes are not saved
How to fix preferences that won’t save
Usernames and passwords are not saved
Waterfox doesn’t save web form entries
Fix problems with websites...
Configure firewalls so that Waterfox can access the Internet
Fix login issues on websites that require a username and password
Fix problems connecting to websites after updating Waterfox
Websites don’t load - troubleshoot and fix error messages
Websites show a spinning wheel and never finish loading
Fix problems
Certificate contains the same serial number as another certificate
Troubleshoot Waterfox crashes (closing or quitting unexpectedly)
Facebook Container isn’t working
I can’t play audio on a Remote Desktop Connection
Identify problems caused by third-party modules in Waterfox for Windows
Refresh Waterfox - reset add-ons and settings
Report breakage due to blocking
Troubleshoot Waterfox crashes (closing or quitting unexpectedly)
Videos don’t have sound on Citrix
Waterfox warned you about malware
Install and update
Recover user data missing after Waterfox update
Windows 10 warns me to use a "Microsoft-verified" app
Windows in S mode won’t let me install Waterfox
Manage preferences and add-ons
Access hidden tabs in Waterfox
Add or remove a search engine in Waterfox
Advanced panel - Accessibility, browsing, network, updates, and other advanced settings in Waterfox
Assign shortcuts to search engines
Cannot remove an add-on (extension or theme)
Change the program used to open email links
Change your default search settings in Waterfox
Choose display languages for multilingual web pages
Waterfox’s performance settings
Personalized extension recommendations
Waterfox options, preferences and settings
Connection settings in Waterfox
Recommendations from Waterfox
Restore previous session - Configure when Waterfox shows your most recent tabs and windows
Startup, home page, tabs, and download settings
Manage local site storage settings
Tips for assessing the safety of an extension
Use Waterfox in another language
Use the Waterfox Sidebar to access bookmarks, history and synced tabs
Display and appearance
Bookmarks Toolbar - Display your favorite websites at the top of the Waterfox window
Change the fonts and colors websites use
Customize Waterfox controls, buttons and toolbars
Font size and zoom - increase the size of web pages
Restore the Menu bar in Waterfox
Use themes to change the look of Waterfox
Import settings from other browsers
Import Internet Explorer Favorites from another computer
Restore bookmarks from backup or move them to another computer
Manage add-ons
Disable or remove Add-ons
Find and install add-ons to add features to Waterfox
Permission request messages for Waterfox extensions
Understanding the risks of installing self-hosted extensions
Add-on signing in Waterfox
Video, audio and...
Control audio or video playback with your keyboard
Watch DRM content on Waterfox
HTML5 audio and video in Waterfox
JavaScript settings and preferences for interactive web pages
Play Windows Media files in Waterfox with the Windows Media plugin
WebXR Permission Info Page
Other
Text Encoding no longer available in the Waterfox menu panel
Personalize Waterfox
Add the Search bar to your Waterfox toolbar
Automatically fill in your address on web forms
Built-in themes in Waterfox - alternative to complete themes
Automatically fill in credit card data on Web forms
Dedicated profiles per Waterfox installation
An extension changed my New Tab page or home page
About Picture-in-Picture in Waterfox
Turn picture-in-picture mode controls on and off
Privacy and security settings
What is the Accessibility Service Indicator?
Content blocking
Configure DNS over HTTPS protection levels in Waterfox
Enhanced Tracking Protection in Waterfox for desktop
Global Privacy Control
HTTPS-Only Mode in Waterfox
Site Information panel
Site Permissions panel
SmartBlock for Enhanced Tracking Protection
Passwords, forms, search,...
Add a login with the Waterfox Password Manager
How to customize Waterfox Suggest settings
Clear recent searches from the Search bar
Control whether Waterfox automatically fills in forms
Edit or delete a login with the Waterfox Password Manager
Import login data from a file
Password Manager - Remember, delete and edit logins and passwords in Waterfox
Use a Primary Password to protect stored logins and passwords
Remove websites from the address bar suggestions
Where are my logins stored?
Protect your privacy
Create secure passwords to keep your identity safe
Delete browsing, search and download history on Waterfox
How do I share Waterfox between people on a computer?
How do I tell if my connection to a website is secure?
How do I turn on the Do Not Track feature?
How does built-in Phishing and Malware Protection work?
How to stay safe on the web
How to stop Waterfox from making automatic connections
Insecure password warning in Waterfox
Mixed content blocking in Waterfox
Settings for privacy, browsing history and do-not-track
Common Myths about Private Browsing
Private Browsing - Use Waterfox without saving history
Secure website certificate
Settings for privacy, browsing history and do-not-track
Third-party trackers
Tips to protect your online privacy
Trackers and scripts Waterfox blocks in Enhanced Tracking Protection
Protecting Privacy while using Web Authentication
What happened to Tracking Protection?
Cookies and cache
Block websites from storing cookies and site data in Waterfox
Clear cookies and site data in Waterfox
Cookies - Information that websites store on your computer
Enable and disable cookies that websites use to track your preferences
Forget button - quickly delete your browsing history on Waterfox
How to clear the Waterfox cache
Third-party cookies and Waterfox tracking protection
Websites say cookies are blocked - Unblock them
Website breakages
Websites look wrong or appear differently than they should
Waterfox Sync
How do I know the status of my sync?
How do I set up Sync on my computer?
Remove a synced device from Mozilla Accounts
Waterfox settings
Allow or block media autoplay in Waterfox
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6.5.4
Fixes
Latest security fixes
1
.
Known Issues
The Restart button is missing on Linux and Windows.
Footnotes
MFSA 2025-09
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