Firefox Community Forum

Watching CNN on Youtube suddenly freezes the tab. Randomly. Freezing means nothing can be done. The video simply stops without reloading or buffering. The mouse reacts, the pointer will activate ie highlight a button under the mouse, but when I click a button nothing happens. The tab freezes and nothing can be done. I can't even access the URL or search box. Nothing. I tried moving the tab itself or into another browser window, nothing. This tab is dead. Opening the same video in a new tab works like normal. I tried the usual things like deactivating Bitdefender, but no luck. Any ideas?

When I click the Firefox icon on my taskbar, it apparently starts OK, but in a second or so the window dims (See first attached image). This window doesn't allow any typed input anywhere, and doesn't close when I click the X in the upper left. This window can be made to go away either by using the Task Manager or by right-clicking on the taskbar icon and selecting Close Window.

However, if I right-click the taskbar icon and select Open New Window, the resulting window appears undimmed (Second attached image) and works correctly.

The above behavior is new; I've used Firefox for years with no problem.

The other user on this machine doesn't see this behavior at all.

Hi,

I recently updated Firefox to the latest version on Windows 11, and since then the browser keeps freezing randomly while browsing. Sometimes it becomes unresponsive when multiple tabs are open, and I have to force close it.

For example, yesterday I was checking a food site with the Dunkin Donuts Menu, and the browser completely froze when I tried switching between tabs. I already tried clearing cache, disabling extensions, and even refreshing Firefox, but the issue still comes back.

Has anyone else experienced this problem after the recent update? Any guidance on what else I can try would be appreciated.

Thanks in advance.

https://www.mlb.com/gameday/braves-vs-nationals/2025/09/17/776286/live

this site at mlb.com or any site showing a live game eventually freezes up and cannot be closed normally. task manager or re-boot is only way out, starting over with a new instance of firefox after ending all firefoxes.

this has been happening just this past few days, after firefox updated to 143.0 on windows 11 using defender, no other screwed up security software.

firefox needs to fix this, it is not likely anything with the site but rather with firefox latest update, as this has always worked before on this same computer.

Dennis Coleman

It takes almost a minute for my home page to come on after I click on My Firefox icon. That has only started happening in the last week or so. But . . . also . . . when I sign into my email account with my ID and complete password, even though I check the "stay signed in" box, that does not happen. I need to fully sign in each time, and that, too, time-wise is somehow related to the delay in getting my home page up. On several occasions I have gotten a message that Firefox is not responding. Thanks for any help you can give. I have Windows 11.

Hello, I'm running MacOS Sequoia 15.5 on a Mac Studio with Firefox version 143.0.1. Ever since I installed Adobe Creative Cloud, Firefox has been hanging on startup. The way I've found to temporarily resolve it is by closing the Creative Cloud software and manually killing the Creative Cloud Helper process, but I would rather not have to do this every time I start my computer. When Firefox is hanging, the 3 processes that use the most CPU are "fontd", "Firefox", and "Creative Cloud Helper". I would assume it's something to do with fonts, but I have no idea how to fix it.

Ubuntu - I use the SNAP version of Firefox - I generally have lots of tabs open but only use 5 or so of them and it's generally fine.... but when I am closing Firefox, it USES like 100% of the CPU and ALL of the RAM and ALL of the SWAP memory when closing.

This locks up the computer.

Sometimes it doesn't quite go all the way but I can watch it all happen in real time, using Task Manager - and that shows a solidwall of all resources occouring, when the close Firefox is run.

I am told by research via ChatGPT that this is a very real problem with the SNAP version and it's best to change to the Debian version, copy all the bookmarks etc., across and then uninstall the SNAP version.

It's rather disconcerting to have Linux crash because of this one app locking it up and frequently.

Chat GPT:

Is there a problem with Firefox Snap Version closing and using all the resources while doing so, which results in locking up the computer?

You're definitely not imagining it—there have been reports of Firefox's Snap version consuming excessive system resources (CPU, memory) and even causing lockups or hangs, particularly during closure. Here's what’s going on and how to mitigate it:

What’s Happening with Firefox Snap?

2. Browser Hangs or Locks the System on Close

On Linux (especially Ubuntu), users have reported that closing Firefox can lead to it hanging in memory, sometimes unresponsive and still consuming resources.
Super User
Ask Ubuntu
A stark example from Reddit illustrates the severity:
“About 50% of the time I open Firefox, it'll reach 100% CPU usage in about 30 seconds… PC completely unusable unless I shutdown.”
Reddit

3. Known Wayland Sway Bug

On Wayland/Sway setups, reloading Sway while Firefox is open can trigger intense logging, causing high CPU use and an enormous syslog.
Fix: Set MOZ_DISABLE_WAYLAND_PROXY=1, or upgrade to FF 125 where the issue is addressed.
Reddit+1

Alternative Approach

Many users, particularly on Ubuntu, opt out of Snap completely in favor of the .deb package or PPA builds. These alternatives often avoid these specific issues. Ask Ubuntu Reddit

Thoughts? Solutions?

Thanks in advance.

whenever i scroll trough a website in firefox, the ewperience is very laggy, feels like its 15fps. i have done basic things like disabling hardware acceleration, smooth smooth scrolling.

Hi,

I'm using Powertoys Keyboard Manager to start Firefox from keyboard Shortcuts. It work almos perfectly except for focusing the newly started window.

The windows opens well, but i' have to click in it to take the focus of it, otherwise i can't type in address bar for example.

I tried to add -foreground in the shortcut parameters, but still not working.

Any idea ?

Thank you very much.

every so often when i go to a site it acts like it is taking a screenshot and fades out and disappears to the bottom right corner.

i was wondering if that was a weird thing firefox is doing or maybe it is something on my end?
i tried to screen record it but it doesn't happen often enough to get a recording of it.

I am running the latest update for Firefox (143.0 (64 BIT) on a Windows 10 Dell laptop. Since the update on August 28th (prior update), my browser has been extremely slow, even with only one tab open. Task manager shows 95% memory usage after 15 minutes of browsing, and I have to end task on Firefox, then reopen the browser. I have run my Webroot antivirus and Malware Bytes, and my laptop is coming up clean.

I am not fond of Microsoft Edge, but I wanted to see how it performed. I have no issues with speed, so I can only guess that this is a Firefox issue.

Are there any known issues with the August 28th update?