Diễn đàn hỗ trợ Firefox

I tried to login to k9data.org. This is a re-write of a product I've used for years. So far as I can tell, others are now using the new version. When I login the screen clears and shows entry into a url called ff.newtabsearch.net. It claims to be a new addon for Firefox. However, following the instruction, I get in a loop and there is no indication that any addon was installed.

Hi. The "What's New?" page displayed all this: __________________________________________________ Help us improve your firefox.com experience

In addition to Cookies necessary for this site to function, we’d like your permission to set some additional Cookies to better understand your browsing needs and improve your experience. Rest assured — we value your privacy. Cookie settings Firefox home

   Features

Top Features

   Fingerprint Blocking
   Ad Tracker Blocking
   Private Browsing Mode
   Free Password Manager

View all Firefox Features

Resources

   Product
       Desktop
       Mobile
       Release Notes
       Support
       Add-ons
   Learn
       Blog
       Compare
       Podcast

Download

Firefox is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Download Firefox ESR 64-bit

Download Firefox ESR 32-bit Download a different build

Firefox is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox. Download Firefox ESR Firefox Privacy Notice Download

Firefox is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Download Firefox ESR 64-bit

Download Firefox ESR 32-bit Download a different build

Firefox is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox. Download Firefox ESR Firefox Privacy Notice Release Notes

   Desktop Desktop Beta & Developer Edition Desktop Nightly Android iOS 

See what’s new in Firefox!

Release Notes tell you what’s new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the system requirements of this release. 143.0.1 Firefox Release

September 19, 2025 Version 143.0.1, first offered to Release channel users on September 19, 2025 Fixed

   Fixed a tab crash experienced by some users caused by DLL injection. (Bug 1872261)

   Reference link to 143.0 release notes.

Get the most recent version

Download Firefox — English (US)

   Windows 64-bit
   Windows 64-bit MSI
   Windows ARM64/AArch64
   Windows 32-bit
   Windows 32-bit MSI
   macOS
   Linux 64-bit
   Linux ARM64/AArch64
   Linux 32-bit
   Android
   iOS

Your system may not meet the requirements for Firefox, but you can try one of these versions:

Download Firefox — English (US)

   Windows 64-bit
   Windows 64-bit MSI
   Windows ARM64/AArch64
   Windows 32-bit
   Windows 32-bit MSI
   macOS
   Linux 64-bit
   Linux ARM64/AArch64
   Linux 32-bit
   Android
   iOS

Firefox is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Download Firefox ESR 64-bit

Download Firefox ESR 32-bit Download a different build

Firefox is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox. Download Firefox ESR

   Download Firefox
   Download Firefox
   Download Firefox
   Download Firefox
   Download Firefox
   Download Firefox
   Download for Linux 64-bit
   Download Firefox
   Download for Linux 32-bit
   Firefox for Android
   Firefox for iOS

Firefox Privacy Notice All Firefox downloads Need help or want to leave feedback? File a bug Leave feedback Get Involved

Did you know that most of the content in Firefox Support was written by volunteers? Find out more Other Resources Developer Information Complete list of changes for this release Press Kit Mozilla and Firefox News Firefox Extended Support Release All Firefox for Desktop Releases Learn more about Firefox Get the most out of Firefox with how-tos and online security tips.

Get Firefox news Download Download Firefox

   Windows
   Mac
   iOS
   Android
   Linux
   Custom Download Options

Latest Builds

   Nightly
   Beta

Firefox for Business

   Enterprise

Community

   Connect
   Contribute
   Developer

Resources

   Compare
   Release Notes
   Learn
   Support
   Add-ons
   Community
   Blog

Follow Us

   Instagram
   YouTube
   TikTok
   Bluesky
   Podcast

Firefox

   Website Privacy Notice
   Terms of Use
   Cookie Policy
   Community Participation Guidelines
   Logo Trademark Licensing

Powered by Mozilla

Putting people before profits since 1998 ___________________________________________________ Wierd. Thanks. Greg

I updated Firefox to version 138 yesterday(29rd April). I use latest stable version of Linux Ubuntu. Sites itself will work, but top of browser wont. Can click open new tab from +-button, but can't close it.

Browser stops reacting to mouse clicks when browsing (after hours of browsing) and I have to use right-click to navigate on sites.... until I restart browser. I tried to close tab and refresh tab when these problems occurred. Also, this occurs on all sites.

I think this is clearly browser problem(because clicked areas are on browser, not inside tabs), not problem in sites itself, because problem manifested itself after hours of browsing, not immediately.

Edit: I'm not well-versed enough to write Bugzilla-report. Also in 138.0.1-1 version, where I updated 3rd May 2025.

Edit 2: I've added picture of area that stops working. Edit 3: On another picture, can't close "Archaeology" tab, no matter what. Edit 4: Clarified things up.

Today I've noticed some horizontal lines on youtube videos. Upon further investigation, I've traced it to a single div element:

The base64 encoded image is the lines I'm seeing.

Initially after starting a new private session and navigating straight to youtube.com I had no lines. Then in that private session same element doesn't have an image:

What's odd about this is if I opened a private window and copy pasted the same video URL I would get the lines. After testing multiple times I started getting the lines even after navigating straight to youtube.com.

So I did another test: changed my IP with a VPN in a private session. Navigated straight to youtube.com, watched multiple videos without any lines. Then I logged in to my account and boom, the lines are back...

Opening the same video on google chrome browser I get a smooth gradient line image:

The browser is functioning as intended, but youtube is intentionally making their website unusable. What the f###? I have youtube premium, adblocker disabled on their website.

For the past week now, every time I go to this link https://marketplace.secondlife.com/ , it is in another language. Usually Spanish or Portuguese and now and then French. I'm always having to translate. Even though my settings says English and i have no other options.

I have forgotten the purpose of the green outline around the page's border. What does it do and how to turn on, after turning it off. Thanks in advance. Let me know if this is an extension or some other feature. Thanks, JJE

Youtube is nonfunctional on firefox as of April 29 2025. It was all working fine last night, then I woke up to no youtube. It loads the website as a blank screen. Videos can be accessed by going directly to their URL, but no recommendeds load in, no comments section, even the title and channel information is unavailable. I would say none of the buttons work, but there are no buttons to test. It works fine in Chrome still. I know it's not my extensions because I tried removing them all, and it didn't fix it. I know it's not my cache/cookies, because I cleared that too and it didn't fix it. I know it's not on Youtube's end, because it works fine in Chrome. I know it's not an update issue, because I updated my browser and it didn't fix it. Please. I want to be able to use youtube in firefox. Please help me fix this thing. I have attached photos, but I suspect they'll be more demonstrative of the problem than useful for troubleshooting.

I get a different UI when I open NotebookLM from google. My pixel tablet uses Chrome and it loads with the standard 3 panels but in Firefox I only get one screen. Everything else works in the program.

Amazon pages don't load on Firefox 146.0.1 (64 bit). I'm using a Windows 11 Desktop PC. I cleared the cache but still have the problem. Please advise. I've used Firefox as my primary browser for decades but if this issue is not resolved, I may be forced to switch to a new primary browser. Anthony

We tried 2 different computers, but two different users. Type in the user name and the password and it looks like it will start up, but then returns to the login paged.

Hello! Today, suddenly, a video player disappeared on the Twitch streaming service (see screenshot), but the stream sound is playing. I tried clearing Firefox data and later reinstalled the browser completely - didn't fix the problem. I installed two versions (115.17.0esr and 115.23.1esr) because I thought the problem was an update. Both versions of the browser have a problem. In another browser, this problem is missing, Twitch is working! Operating system Windows 7 Pro SP1. Can you please tell me how to solve this problem?

When attempting to access the Twitch website in normal browsing mode, the page does not load properly. Instead of the site rendering, I only see a black screen with an infinite loading spinner.

This issue does not occur in private browsing mode (incognito), Twitch loads normally there.

I found that performing a browser reset temporarily resolves the issue, but after some time the problem returns. Continuously resetting the browser is not a practical solution.

Additional details:

   Browser version: 141

   Steps to reproduce:

       Open Firefox in normal mode

       Navigate to https://twitch.tv

       Observe black screen with loading spinner

   Expected result: Twitch should load normally

   Actual result: Page remains blank with a loading spinner

   Private browsing mode works correctly

Please advise on a permanent fix or steps to diagnose this issue.

I recently upgraded FF on this computer and can no longer sign in to my att.net email account, although I was able to sign in on another computer on FF earlier today. I just get an error message and Att can't help...is there a setting that has me locked out? I can also access email on other browsers just not the FF version on this computer.

No idea if this is the right topic or not but I've been dealing with this frustrating issue where with some websites it just loads a blank white screen. I've tried every fix I could that I've seen on forums like this as well as on Reddit and nothing I've tried has fixed it. From launching in Safe Mode or changing things in about:config. Before finishing this post I tried launching in safe mode, so my add-ons and plugins are disabled and it still persists with websites loading in these blank white screens. I never had this issue at first and I'm sure it started to happen after an automatic update a while back.

I need this issue sorted out so I can look and compare items from shops but most of the time a website that works and I look at it elsewhere I'm dealing with this issue. No issue looking at stuff on the internet on my phone, though I do use safari instead on my phone.