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After the update on the 14th, dark mode has gained weird stylistic choices that I cannot find a way to alter: namely, when closing a new tab, a white box with black font appears -as opposed to the previous darker toned grey/purple with white font. However as of writing this post, I notice that dark mode is not working on this webpage. Seeing as I have an extension enabled in addition to the basic dark mode selection in Firefox settings, I can only imagine that something was broken in the update. Please advise, the change is jarring.

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

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.

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

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.

Dear Community,

the userChrome.css I used to use to disable the search bar expansion on focus no longer works (http://userchrome.wesleybranton.com/megabar). I disabled all urlbar.search options in about:config. But Firefox still gives me suggestions when I start typing about (as in about:config).

toolkit.legacyUserProfileCustomizations.stylesheets is set to true. The userChrome.css is inside the chrome folder inside the profile directory. I'm on 140.3.1esr (64-bit).

How do I disable this for good?

Thanks in advance!

I have attached a snip of my Firefox GUI.

Glaring white backgrounds in webpage GUIs are, simply, a Pain in the Eyes! I like to get rid of them and I have done for the webpage text background you can see in the image. Now, what I would like to be able to do is to set the same colour as the text background in the URL window and the Bookmarks window.

Is this possible? How is it done?

Thanks

Why am I not able to get sound when watching a video while connected to the internet? If I use Chrome or Edge the sound is fine. Could it be an incorrect setting? Or is this a common problem you are already aware of?

How do I get back to the 'old' format of Bookmarks with Folders and Sub-Folders. I do not like the newer style of 'most used' along the right column. I prefer to see ALL of my Bookmarks along with any sub-folders contained within. Thank You, Jim Bigger

Today on my (android) phone I received a Firefox update. I have auto update turned off, so I don't know when it was initially available, but I installed updates on all apps late this morning. It reset all of my privacy and search settings. I first noticed because it was giving me google and firefox suggestions as I typed, and I find all autocomplete/suggestions to be annoying and not helpful, so I have always had this turned off as I NEVER want any suggestions. Finding that I checked my other settings, and found that all AI, Firefox Suggest, and usage/diagnostic data were all turned on which were not earlier in the day. I always have this garbage OFF.

After work I checked all of my devices. All of them are set to update automatically but one. That is the only device that did not reset my privacy and search settings, but as soon as it updated it did. (none of my other settings seem to be impacted, as other things I've changed are still there).

Is this going to be standard practice now? I don't even get notifications when it is updated so how will I know to turn this off? Do I just have to check every day? I did a security check just a week ago and all of my settings were off. I do this every few weeks as windows likes to change my settings and install apps I don't need with updates so I regularly check all my apps privacy settings on my phone and PCs.

Is this a known issue? Is this going to be resolved? I don't like when companies collect my data after I have turned it off.

I have Firefox set to reopen the previous session whenever the browser is launched. I normally have multiple windows open; I have different tabs in different windows so as to organize them and make it easier to access a particular tab / type of content. I can mouseover on the toolbar and select a tab via preview.

Until recently, whenever Firefox relaunched my previous session, it kept the arrangement of the windows intact (from right to left in the preview). After a recent update, I assume, Firefox is now no keeps them in the same arrangement; aside from my first window, all the others now randomly (or so it seems to me) rearrange themselves whenever the browser launches.

I can reorder them by selectively closing and reopening windows, but it's getting tedious, and the arrangement only lasts for the current session. Once I shut down and restart my computer the windows are, once again, rearranged to no apparent rhyme or reason.

This is getting really frustrating.