Firefox Community Forum

As of a few days ago (potentially coinciding with the most recent update?) I've had several websites become varying degrees of unresponsive when using Firefox while being connected to a VPN (Nord, in this case).

Some sites will load but then get throttled--i.e. YouTube will load and (usually) populate thumbnails, but clicking on a video will result in the video instantly dropping to its lowest available resolution, playing for a few seconds, and then stalling. Interestingly(?) if I try to watch a live stream, chat will be fully functional but the video will be unable to load. Other sites will load but then very quickly stop responding at all. Others are straight up just not loading period, while many others have no issues at all.

I've cleared my cache, deleted cookies for the affected sites, tried Firefox in a private window, tried Firefox with no extensions, and reinstalled both Nord and Firefox to no avail. All of the affected sites are fully functional so long as I'm not connected to a VPN, and are also fully functional on other browsers, even while connected to a VPN. All other non-browser related applications that require the internet are also unaffected, and my internet speeds in general aren't showing any issues.

I've been unable to find any other chatter about this anywhere, and I unfortunately don't have any other devices available to try and replicate the issues. I would not be surprised if it was one of those wonderful Me Exclusive DNS issues or something, but figured it was worth throwing out there.

I have read a number of reports of tab crashing, which I have continually. Running 133.0.3 (64-bit) on Win 11 Home 23H2. Very inconsistent crashes, sometime will open new tabs other times it will crash. I have reinstalled no change. I ran refresh, no change and now when I open Firefox I get a message to restore windows. I can't seem to get that message to go away. Any suggestions, especially about the opening message? I have used FF for years and am almost at the point of switching to Chrome. As an aside, also have problems on some websites processing information/orders when using Firefox. No problem when I switch to Chrome. Thanks in advance......

A few days ago, something happened to the Firefox browser. The speed is simply terrible, sites are loaded for several minutes. Reinstalling does not help. Other browsers work fine.

I have just installed Firefox on a new iMac, running MacOS 15.2. Firefox will not load any of the websites I have tried, whereas Safari and Chrome do. I have cleared the History and also set "No proxy" but loading still fails.

Firefox Nightly (next generation web browser test) has no animation delay when playing sprunki, but there is a bug in the beta and current versions that become delay. (That's why I use other browsers.) There is no delay in other browsers. I hope it will be fixed.

Hello,

This new version of firefox. I am experiencing icons grey out whenever I opened a new tab. Is anyone experiencing this below?

[Highlighted Icons in new Tab https://i.postimg.cc/RFzrm98Q/Screenshot-2025-03-05-012153.png]

I'm very frustrated with FF. It's running slow. Downloads are slow etc. I've tried everything that FF has recommended up to and including "refresh" with no effect. It's getting to the point I'm considering not using FF. Does anybody have any suggestions?

For the last day I've been having a problem with FF slow to load. I've tried the troubleshoot mode with little change. When it does load I can have problems with certain web sites loading e.g. Youtube, MSNBC, AOL mail etc. It's never consistent. The cache is clean and I've saved all the relevant cookies, I checked my internet provider and they are having no problems and I don't seem to be having any internal hdw issues e.g. ethernet cable connections etc. I reinstalled FF-not a clean install and seemed to help for a time. Do I have any options other than a refresh? I don't seem to be having the same issues with Edge or Chrome. All W11 updates are current. I look forward to anyone's comments.

I walked away from my laptop for about an hour and when I came back my task bar was gone. What happened to it? and how do I get it back? Below is the spec's of my lap top that I use/have been using/task bar missing

Hello,

I'm facing a two-fold problem:

1. Firefox (138.0.4, 64-bits): when trying to open a website the URL is loaded in the FF-tab, but the screen stays empty

2. Thunderbird (128.10.0esr, 64-bits): downloading messages isn't possible anymore. When sending a message I get following error message (in Dutch):

Verzenden van het bericht is mislukt. Er is een fout opgetreden bij het verzenden van e-mail: fout met uitgaande (SMTP-)server. De server antwoordde: Cannot connect to SMTP server 127.0.0.1 (127.0.0.1:54601), connect error 10061.

Translated to English:

Sending the message failed. An error occurred while sending the email: Outgoing (SMTP) server error. The server responded: Cannot connect to SMTP server 127.0.0.1 (127.0.0.1:54601), connect error 10061.

I did a ping with following result:

C:\Users\<user>>ping 127.0.0.1

Pinging 127.0.0.1 with 32 bytes of data: Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 Reply from 127.0.0.1: bytes=32 time<1ms TTL=128

Ping statistics for 127.0.0.1:

   Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

   Minimum = 0ms, Maximum = 0ms, Average = 0ms

I didn't make any changes to FF and/or TB, and my wild guess is that the necessary Mozilla servers aren't available anymore, due to:

May 21, 2025

No incidents reported today. May 20, 2025 Mozilla Monitor website will be down for 2 hours starting 5/20/2025 at 6 AM PT. Completed - The scheduled maintenance has been completed. May 20, 15:02 UTC Verifying - Verification is currently underway for the maintenance items. May 20, 14:40 UTC In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. May 20, 14:00 UTC Scheduled - Mozilla Monitor website will be down for maintenance for 2 hours starting 5/20/2025 at 6 AM PT. During this time, the site will be unavailable.

If somebody could step-in, that would be great!

Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window.

I've rebooted, reinstalled, can't get it working.

When saving images from websites using the save image as feature, Firefox will freeze up and not register any mouse click or anything instead making a ding noise every time is register a mouse click. This will continue for like 30 seconds before it becomes normal then it will repeat this for every image. How can I solve this?

Subject: Assistance Required for Frequent Firefox Crashes on Ubuntu

Dear Developer Team,

I am facing persistent issues with Firefox crashing on my Ubuntu PC, and the problem has been ongoing for the past 40–50 days. Despite multiple attempts at troubleshooting—including uninstalling and reinstalling Firefox, clearing all caches, and other measures—the issue remains unresolved.

I’ve noticed that Firefox works for a few days after reinstallation, but then problems begin to surface, such as a half-screen display. Eventually, after restarting the PC, the browser starts crashing again.

Could you please investigate this matter urgently and provide a resolution? Additionally, I would appreciate it if you could clarify whether this might be related to a RAM issue or some other underlying cause.

Looking forward to your assistance.

Best regards, zimmi

A few weeks ago, just after I tried to delete the cache and tracking cookies from Firefox (using AVG TuneUp, which seems to have taken more than I asked it to remove), my browser started refusing to load any new sites, or reload inactive tabs, once I had been using it for about five minutes after rebooting it. It also crashes completely when I try to download or upload anything after that point, which is irritating but does mean I have some crash reports to share (bp-5a7c5f6e-0d55-451a-8b2b-15b360250524 is the latest one). I've tried everything I can think of or find on the Internet - Troubleshoot mode, disabling and re-enabling hardware acceleration, refreshing the browser, uninstalling and re-installing it with and without restarting the computer in-between (which seemed to work for a while), culling tabs (although, if I'm reading the crash reports correctly, lack of memory isn't the issue after all; certainly, Chrome doesn't have the same problem even when using more memory than Firefox did), even running diagnostics on my computer's RAM and hard drive - but nothing's fixed it. What might be going on, and how can I solve this problem?

I tried all common troubleshooting steps: deleting cache reinstalling different settings turning off adblocker/vpn disabled efficiency in task manager and set it permanently to off in FF

I used to have 1000+ tabs in 2016 no issue. I had problem in past with Firefox using 100% CPU which now it is not using only like 50, but memory is getting full 89% i use also large page file on ssd. Problem is even when i restart firefox it is slow with low RAM usage! SO that's not it! Even 5 tabs sometimes it is slow!

It is so damn slow it drives me crazy! I tried also Quantum in past when Firefox has 100% CPU usage bug and it was only tiny bit better but still caused 100% CPU usage!

All other browsers are anti user cannot even stop Autoplay literal terrorist Firefox is only normal browser unfortunately performance compare to 2016 got absolutely abysmal! I had this problem even in-between reinstals of OS so it doesn't seem it is me. I play demanding games no issues on my PC...

When I open Firefox it opens a maximized window with tabs, then it opens a minimized with a single tab, then it reopens a maximized window with all session tabs. Each window displays in succession, one window at a time.

I'm on desktop using Windows 11.

I just read a post saying this behavior was caused by the resist fingerprinting feature. Can someone explain how that causes the repeated opening of browser window 3 times. Is there a way to retain the anti-fingerprinting behavior w/o the multiple window opening behavior?

I have noticed a weird scrolling bug in Firefox since either v138.0 or v138.0.1.

If you go to https://www.architecturaldesigns.com/ and select any floor plan, if you attempt to scroll down the page the page will not let you and snap back to the top.

I tried this in Firefox troubleshooting mode with all add-ons / themes disabled and encountered the same behavior. This is something that just started happening in the last version release or two.

This is present both on Windows as well as Mac versions of the Firefox browser.

For some weeks I have ad an issue with Firefox using 50%-100% of CPU. Normally it is the Firefox process itself, sometimes it is also "Privileged Cont".

OS is Kubuntu 24.04. Firefox has done this across 2-3 versions.

Things I have tried:

Restarting Firefox No change, I'll even get 100% cpu usage with no tabs open

Refresh Firefox to remove settings and addons No change

Uninstall Snap and try direct Apt package No change

Remove ~/.mozilla to fully remove any residual settings/cache/etc No change

Try with and without hardware acceleration See: https://support.mozilla.org/en-US/questions/1308215 No change!

I would blame my old computer hardware, but Brave runs fine. I am now using Brave, but would dearly like to return to Firefox as I miss containers, and I don't support a chromium dominated web.