Firefox Community Forum

Also McAffee notification with all these popups stating that my McAffee protection expired yesterday - I have never had a McAffee notification for a virus or pair for protection from them. Popups are happening every 10 seconds continuously! looks like about 20 or more popups describing different problems with 20 digit numbers and letters as a serial number of the problem!

For the very first time, today I got the following, "Gah. Your tab just crashed." and it now happens every time. What's up? Is this a Mozilla problem? Should I be moving on to a new browser? Help!

I'm experiencing an unusual issue in Firefox: a CSS grid overlay is visible on various websites, while everything displays normally in other browsers (Chrome, Edge, etc.). This grid is not part of the actual website design and does not appear when using other browsers.

I haven’t activated any developer tools or extensions intentionally that would cause this behavior. Could you please help me identify what might be causing this and how to disable it?

When I encounter an embedded video on a website that plays, an icon to toggle picture in picture pops up in the URL bar (see attached image). I don't use picture in picture, and for some websites which have an "endless scrolling" experience with videos, such as reddit or facebook, it is slightly annoying that while I am focusing the middle of the screen, something changes in the top right, making me think a tab has an update and changed title. I have the picture in picture controls turned off in settings (one with the id=pictureInPictureToggleEnabled in general, my Firefox is not English), I thought it would also make said button go away but it does not.

im having issues with my tabs as there are now two sets of tabs one that is empty basically and seems to be treated as the main one and the other that is all my other tabs... but when i try to switch to them it switches my screen so other apps like games or messaging apps no longer are visible yet the still appear to exist

When trying to "Save" after pro-cococut finishes downloading a file that is larger than 1 Gig and I can't find out what to do in order to have it save large files.

In Firefox, the animation exhibits performance issues like stuttering, particularly in elements that rely on animateTransform and animate for movement or opacity transitions. This issue is not present in Chrome, where the animations run smoothly without any noticeable lag.

Expected Behavior: The animation should render smoothly on both Chrome and Firefox without any stuttering or lag, providing a seamless experience for users.

Steps to Reproduce:

Open the provided SVG code in Firefox.

Observe the animation, particularly the elements with animate and animateTransform attributes.

Notice the stuttering or lag compared to the smooth rendering in Chrome.

Is there anyplace that shows how to use what the new release says on the 146.0. I got the message below when viewing new options in 146.0, but going to settings, sync just wants me to sign in and do a cloud backup.

Doesn't sound like what is in message below that I got after updating to 146.0. From what I found looking around, you are suppose to go to setting, sync, click on backup and choose location. There is no option backup, just an option to sign on. Below is message I got when checking what is in update 146.0:

Windows 10 users can now automatically protect their passwords, bookmarks, and more by turning on backup in Firefox. Your browsing data is saved daily on your device and can be encrypted with a password When you set up a fresh install of Firefox on any operating system for a new device or your current one, you can restore from this backup and pick up right where you left off. This feature is currently available on Windows devices and will be coming to other operating systems soon.

While running Firefox on MacBookAir with macOS 15.7.2 to browse simple websites I keep getting the below warning message. I may have 2 or 3 other apps open (like Apple Mail, MS-Word, Preview). "Heavy memory usage You're running out of memory and your Mac may become noticeably slower. Consider quitting some applications. Firefox 2,48 GB" So I quit Firefox to re-open again and continue my work. Does somebody has an hint where this message can come from ? Any settings to change on my MAC ? Thanks for helping

My SSD boot drive crashed -- Rebuilt system (brand new SSD boot drive) and reloaded all of my data from a separate backup, however Firefox profile is gone. I have copies of the old profiles including the places files, etc. Following Mozilla's instructions I reloaded the old profiles. Firefox starts right up but *without* my bookmarks, etc. Unfortunately there was no "old Firefox data" folder saved and I could not retrieve the bookmark specific backup. Thoughts? Thanks!

When I click on a link in emails to open in browser if email has display problems, it opens a blank webpage and a small window that I clicked on OK reappears with Firefox as my default browser. See attached screenshot. If I select Edge to open the email, it works fine.

Please address.

I'm using W11 & Firefox/Mozilla 'Version 146.0 (64-bit)' in ‘Dark Theme’ - my sidebar bookmark in use is now 'highlighted in BRIGHT blue' which is VERY ANNOYING - can I get rid of this feature? Is there a way to adjust the highlight color/intensity? Please let me know. If there is no adjustment possible, please take care of this in your next version. Thanks, John

This might be quite "old man yells at cloud" of me, but oh my god I am so fed up of everything putting AI in as a "feature" for no reason.

1) No one asked for this. 2) It is bad at doing whatever it is designed to do. (It's not helpful, it's not even neutrally unhelpful, it's ANTI-HELPFUL.) 3) It is always on by default, or worse, impossible to turn off.

At the very least AI features need to be off by default, because it's rubbish.

Firefox is meant to be a bastion of sanity and safety in a world of exploitative techbros trying to steal our data and trick us into making money for them. So-called "AI" goes against this. Please, Firefox, be better.

As of 20th Nov 2025, here's how to turn off AI features. Go into about:config and set all of these to false (yes, you’ll have to copy and paste them one by one):

• browser.ml.enable
• browser.ml.chat.enabled
• browser.ml.chat.menu
• browser.ml.chat.page
• browser.ml.chat.page.footerBadge
• browser.ml.chat.page.menuBadge
• browser.ml.linkPreview.enabled
• browser.ml.pageAssist.enabled
• browser.tabs.groups.smart.enabled
• browser.tabs.groups.smart.userEnabled
• extensions.ml.enabled
• browser.search.visualSearch.featureGate

in addition to nuking AI, it’ll also speed up your browsing

使用系统：win11。我在之前的Firefox上已经登录了账号并开启了自动同步，前天我重新安装了系统并下载登录了账号。登录了账号之后并没有重新同步我的书签，我手动同步多次没有结果，并等待了一段时间自动同步，以及观察是否会同步书签到本地，结果仍没有。于是我尝试用我手机的Firefox登录电脑的Firefox，结果才同步了我手机的书签信息，但我手机的书签信息已经过时。而且电脑的Firefox显示可以和手机的Firefox互相同步信息及标签页等，但我观察后发现并没有完全同步，我电脑/手机的信息及标签页都是一天两天之前的，手动同步后仍然没有看到有更新。我希望同步回服务器的书签信息！