Firefox Community Forum

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.

Good afternoon

Copied Firefox profile in W10

Pasting into Profiles folder in W11 but it won't let me do it. See attached.

I have enabled LongPaths in the registry but that hasn't solved the problem.

Please advise Michael

The website in question does not recognise that data has been entered when it comes from Autofill. The only solution is to manually enter the address details manually. This does not happen on the same website in chrome or Edge. This s enough to send me back to chrome....

Hello everyone,

Like most of you, I'm aggressively attacked by advertising new tabs.

I'd like to have this: my tabs static, no movement, all fixed sizes, and no new tabs on redirects. If I need a new tab, I manually click the "+".-sign.

Fox tries to fit all tabs in, at the same time.

What I have tried so far is not working:

1. pinned tabs always get un-pinned at restart

2. pop-ups are stopped in Firefox own Settings

3. my settings in about:config: browser.uidensity = 0 browser.tabs.animate = false browser.tabs.tabmanager.enabled = false browser.tabs.allowTabDetach = false browser.tabs.tabMinWidth = 68 px dom.popup_allowed_events = False browser.tabs.loadInBackground = false services.sync.prefs.sync.browser.tabs.loadInBackground = false accessibility.blockautorefresh = false services.sync.prefs.sync.accessibility.blockautorefresh = false toolkit.tabbox.switchByScrolling = False browser.link.open_newwindow = 2 browser.link.open_newwindow.override.external = 3

Tabs still move, change size, and unwanted ones appear. :/

What settings should I change, add, or remove? Anyone more proficient than me, in about:config-programming?

Cheers!

Good afternoon, After an update in recent weeks, all bookmark icons look like a globe. A few change back to the original icon after clicking on an address, but revert to the globe after restarting. Previously, I could find the address very quickly based on the icon, but now it's very difficult because I have to read and select each individual address. Kind regards, Johann Kowalski

Hello All -

Over the years I have saved many bookmarks across several different devices. Therefore the bookmarks vary between devices. Is there any way that I can tidy up my bookmarks, deleting many of them, on my main machine and then have all the other devices Synch to that list only?

I have tried deleting ALL the bookmarks on the "subsidiary" devices and then synched them but that didn't work. I think I'm asking whether one device can be made the "master" for all the others to Synch to that one and none of the others.

Hope that's reasonably clear.

Thanks,

Ian.

Hi.

I have a problem with minimizing the Firefox window on a MacBook (M1, 2020, Tahoe26, FF 141.0.2 (aarch64). After launching the browser, using Command+M for the first time works and the window moves to the taskbar normally. When the FF window returns, the shortcut stops working and the Command+M Thumbnail option becomes grayed out. It doesn't matter if FF is in fullscreen mode or not - the shortcut only works the first time. ____________ Cześć. Problem dotyczy minimalizowania okna Firefox na MacBook (M1, 2020, Tahoe26, FF 141.0.2 (aarch64). Po uruchomieniu przeglądarki, za pierwszym razem użyciu Command+M skrót działa i okno normalnie przechodzi do paska. Po powrocie okna FF, skrót przestaje działać, a opcja Miniaturka Command M staje się nieaktywna. Nie ma znaczenia, czy FF jest w trybie pełnoekranowym, czy nie - skrót działa tylko pierwszy raz.

Recently I lost my earlier mobile phone and purchased a new one. I tried many times but every time the pairing/sync to my new device is failing. I am tired of this. Can you help?

Is there a way to change to size of the font on the tabs? It's very small. I've tried through settings, changing the letter size but it doesn't change the type on the tabs. Help!

Suddenly, I can no longer log in to iCloud on my MacBook Air from Firefox: I get the login alert and the code to validate the connection, but the window to enter the verification code doesn't appear. It says "enter" the code, but I don't get the window to do so!

I'm on Big Sur 11.7.10, it worked without a hitch for years. This laptop is one of my trusted devices. Is a recent update preventing the connection?

I looked at similar questions, and answers from 2020 said to add the 6-digit code after my password, but that solution doesn't work.

It seems the problem is with Firefox; it works on Safari. Any solution for Firefox?

Thanks

After doing the last up date of Fox Fire on or about Aug 27, have not been able to load Fox Fire with all of the previous files, start menu bookmarks/history. Tried restarting as suggested but no luck. Benn dealing with this for several days. Unable to get to Outlook to get email, etc,. Is going to be difficult to email me as not able to get into my email. Did several restarts as explained in Fox fire. I might be able to get into email using my phone.

All the help articles do not really explain how to restore Fox Fire to a previous point. At least in all the articles I read.

I have an Occasional Issue where Youtube Stutters, or lags. A good example is When I Press Pause the video will respond 5 Seconds Later. Or When I grab my mouse it will dissapear when I reach the video box. I do have You tube premium, and I do have U- Blcok origin and Malware bytes. But U- block and Bytes are disbaled on any youtube page, And I pay for Youtube Premium as well.

I use Bitdefender as antivirus program. When I start up Firefox the antivirus program blocks the start up because it says Firefox is trying to access a program (sync.contextualadv.com) which does not have same authentification as the target. It gives me choice to accept this as an exception if I want. I don't understand the details but I don't want to allow this to proceed until I'm sure it is safe. I'm on an HP computer running Windows 11. I use firefox on another laptop running Windows 10 and have not had this problem.