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This morning, Firefox updated automatically to Firefox 144. However, this update completely broke Firefox; every tab crashed, and I couldn't even use Firefox to get to this help site.

Edition Windows 10 Enterprise Version 22H2 Installed on ‎03/‎25/‎2022 OS Build 19045.6332

Changing my OS is not an option for me; those decisions are made far, far away. I was allowed to use Firefox instead of Chrome. Sadly, I have to switch over to Chrome today in order to work.  :(

I have added a couple of screenshots.

I am moving over to Chrome to do some work.

Thanks for any help, B

Being able to tell anyone what's going on is almost impossible. I am thinking of deleting Firefox despite having been using it for years, a loyal customer who subscribes to your VPN. When I log in my pinned tabs do not open the web sites, I'm told I've got connection issues, I've removed the sites from tracking protection, X tells me that is an issue since it only started after the update before todays update. What is the point of pinned tabs if they don't open? If I can't resolve this issue I will use Chrome, All of my pinned sites open there I just have to get used to using another browser, I don't like Chrome very much but I'm pulling my hair out getting no joy from Firefox. There has to be a better way of contacting Firefox than spend ages online as though it's top secret! I'm using windows 11 24H2

I have WhatsApp Web pinned as a tab in Firefox, and other than that I also have a home page. Normally when I launched Firefox, only one window would open and it would have both the pinned whatsapp tab and the homepage in another tab.

Since today, now when I launch Firefox it opens two separate windows. One window only contains the pinned WhatsApp Web tab, and the other window contains the home page.

How can I make it so that when I launch Firefox only one window opens that contains both tabs? Please don't tell me this option has been inadvertently removed.... Thanks.

I can't open https://english.ahram.org.eg and https://gate.ahram.org.eg/ Someone knows why? Maybe it has something to do with the last update. I think I could open them some time ago. Thanks!

https://share.firefox.dev/4n9AQMN

I seem to get really high CPU and memory usage only when I run youtube on Firefox. This issue never happened before. How can I fix this?

I upgraded to Firefox 143.0.4 and lost all of my Bookmarks. How do I find and reload my Default Profile? Also, I cannot load anything in Firefox I am forced to use Edge which I do not like at all!!!!

Just moved to W11 - initially I had to resolve the bookmarks functional error message - done, but I seem to have a long list of items suggesting many bookmark folders - with items that were just links to sites I had been on - and the original bookmarks folder I had created does not now appear?

Following help on here re bookmarks and history system non functionality - I have renamed files and deleted files such as favicons.sqlite etc etc - but that has not resolved any issues.

Not sure that explains it - hope you can help.

HI and thanks for any help.. I am Popping my gmail and several other non-google accounts. It has worked for years but now I can't pop any gmail after 10/10/25. The mail is there when I go to the gmail web page. It is trying to Pop it cause I can see the message on Thunderbird "there are no messages to download" from that account. I checked and there are no filters. I did a test email. It shows up in gmail but won't pop to my PC. all the other non-gmail accounts are working fine with new messages coming in. I checked all the subfolders and nothing there since 10/10. Any ideas? Thanks. Kevin Brand

Hello. I accidentally made multiple copies of one folder and some of its nested folders. I can't move them back because the copy was already found in the main file. How do I remove the duplicates?

I tried to add a new account with PROTON mail and it didn't accept it. Can it be done? Is there a problem? The goal is to have 2 accounts and not just one. Can you fix it?

Something happened that took away my 'get messages' button and my 'write' button and the others that used to be there.

I can find nowhere to add these back. When I try to adde them back in view-toolbar-toolbar settings, 'SAVE' is greyed out.

Either I am a real dumb user or this is a real dumb bug that cropped up today.

I have no way to get messages or write one now.

MACOS Tahoe 26, 140.3.0esr (aarch64)

Hello,

we are currently experiencing high memory usage issues with Firefox on our terminal servers.

Problem description: All employees work within a terminal server environment. When using web applications such as Vimcar (https://fleet.vimcar.com) in Firefox, we observe a very high RAM consumption. A single Firefox tab can consume 2 GB of RAM or more after being open for several hours. As a result, the terminal server becomes slow or unresponsive, and other users on the same server are affected. Since the terminal server allocates resources on demand, a hanging process continues to request memory until it eventually terminates itself, which severely impacts overall system performance.

Questions: 1. Are there settings or configuration options to reduce Firefox’s memory usage in terminal server environments? 2. Are there recommended best practices for running Firefox with memory-intensive web applications on terminal servers? 3. Is it possible to set memory limits per tab or per user session to improve stability?

Thank you very much for your assistance.

When I have Firefox and a word document open in my mini mac the Firefox application image is suddenly pushing out or sight any word document I also have open at the same time. Conversely, when I relocate the word document and seek to open it again Firefox gets pushed out. What is going on and how do I stop it?

I am not experiencing this problem when I have Safari and a word document simultaneously opened.

fred 10/14/25 at 1:20 pm PST [email removed]@gmail.com

Hi, I recently set up TB with one imap account. All fine. I set up a Local Folder as well - mainly to store bulk of old mails.

Then after couple of days, when I sent a message, the system warned me: "your message was sent, but a copy could not be placed in "Sent" folder" due to network or file access issues. Place a copy in local folder instead?"

I recognized, that also, while my account/server seems to connect, no emails at all are fetched from the server actually.

I think there's a strange problem TB internally with ... file access? How to repair?

UPDATE : I checked my TB profile folder, and found the "ImapMail" folder's properties (Win10) showed "read-only". So I closed TB, removed the "read-only" from folder and contents, and restarted TB. But issue persisted. I went back to "ImapMail" folder in my profile - and found it marked "read-only" again. So seems TB itself set it to "read-only", it seems.

Thank you for your advice. Chris

PS:

• Restart : nothing changed
• run in safe mode: nothing chnaged
• repaired folders: nothing chnaged

Hi all,

I cannot log in with a certain work account in Thunderbird any more, due to a failure that occurs during the OAuth process (error 530084).

While checking internally, we noted that the login information that Thunderbird is providing does not provide the Device Platform, state or identifier. I assume that this is data obfuscation done for privacy reasons but is there a way to disable it for on a device, specific account etc.?

Thank you for the assistance in this matter.

I cloned my 2017 intel iMac onto an M2 Macbook Air. Since one week I use them independently and keep Firefox synchronized. I changed their names in Firefox sync. But under "connected devices" at first there was only one of them, depending on which one I refreshed the open window first. I tried to separate them by logging out and in again, but now both are gone in the list. Nevertheless, syncing works. I hope my Mozilla account won't get garbled up.