Firefox Community Forum

Hello fellow Firefox users, I sadly cannot use my Firefox (120.0.1, 64 bits, Windows 10) anymore as it is too slow to show a webpage... It's so slow, that I initially thought that I have no internet connexion at all on Firefox.

Can anyone help me figuring why my Firefox profile is so slow ?

Long story short:

- Until 2023-12-05, my Firefox was working normally.

 My parameters were "No HTTPS everywhere" and "No DNS over HTTPS (DoH)".

- On 2023-12-05, I was connected to an entreprise DNS (Mangling DNS).

 I cannot acces some website because of their local policy, so I changed my DNS parameters.
 I choose to use DoH with Cloudflare instead of the given DNS.
 Internet worked perfectly.

- On 2023-12-06 and 2023-12-07, same parameters, Internet worked perfectly on another network. - Since 2023-12-08, Internet is very slow. It need about 1.5 minute to get start.duckduckgo.com loading on any network.

 I thought it will not load at all (timeout ?).
 Others webrowsers (e.g. : Microsoft Edge) are correctly working.
 The "ping google.com" command is working normaly on windows with 2ms delay.
 The DNS on windows "Get-DnsClientServerAddress" are the normal DNS of the router.
 Even with reverting the DoH parameter to off, I do not get back my web browsing speed.

Troubleshooting :

- It's slow with "DoH and Cloudflare" activated.

 It's slow on my home network.
 It's slow on a public network.
 It's slow on another private network.
 https://www.dnsleaktest.com gives me a list of Cloudflare DNS (IPv4) near me, different from the DNS (IPv6) used by Windows 10.
 Meanwhile, Microsoft Edge, ping and wget/curl are working normally (i.e. no delay).
 Noticably, Microsfot Edge use by default according to https://www.dnsleaktest.com the same Cloudflare DNS.

- It's slow with "DoH and Cloudflare" NOT activated.

 It's slow on my home network.
 It's slow on a public network.
 It's slow on another private network.
 https://www.dnsleaktest.com gives me one DNS from my ISP (IPv4), same value as the DNS (IPv4) used by Windows 10.
 Meanwhile, Microsoft Edge, ping and wget/curl are working normally (i.e. no delay).
 Noticably, Microsfot Edge use by default according to https://www.dnsleaktest.com the Cloudflare DNS.

- In about:crashes there is not relevent crash (only old crash).

- I have not changed any about:config parameters in the 2023-12-05 to today (2023-12-12) period.

- I have run mozregression GUI with no problem.

 The program oppened succesfully start.duckduckgo.com .
 This website was choosen as it is an allowed website on every DNS.
 Firefox nightly (mozilla-central) 2023-06-02 : good
 Firefox nightly (mozilla-central) 2023-09-03 : good
 Firefox nightly (mozilla-central) 2023-10-20 : good
 Firefox nightly (mozilla-central) 2023-11-12 : good
 Firefox nightly (mozilla-central) 2023-11-24 : good
 Firefox nightly (mozilla-central) 2023-11-30 : good
 Firefox nightly (mozilla-central) 2023-12-03 : good, show a message saying more or less "Nightly started with no extension"
 Firefox nightly (mozilla-central) 2023-12-04 : good
 Firefox nightly (mozilla-central) 775ade8b :   good
 Firefox nightly (autoland) 87d12c4b :          good
 Firefox nightly (autoland) ba8757a7 :          good

- Firefox 120.0.1 is saying that it is up-to-date.

 And as of today, it is.

- I do have some extensions (12 activated) on my Firefox, so I try without extension.

 It worked but I do not understand why!
 * New profile. Using "firefox.exe -profile" I created another clean profile to see.
                It worked.
                According to https://www.dnsleaktest.com, my new empty profile uses both Cloudflare DNS (IPv4) and the router DNS from the ISP.
                Adding one-by-one most of extensions (6 now) to this new profile do not break yet my Firefox speed.
 * Safe Mode. Using "firefox.exe -safe-mode" I have started my corrupt profile without extension, JIT, etc...
              It worked.
              According to https://www.dnsleaktest.com, it uses only the router DNS (IPv4).

- I can send some result from about:support if needed, but it kills privacy...

Conclusion :

I do not understand why my main Firefox profile is not working correctly. I do not see strange things when troubleshooting. Nothing makes sense.

May someone help me figuring out?

Regards, eliotlencelot.

I am using Firefox Nightly 122.0a1 on Windows 11 and my sound stopped working a few days ago. I already reset Firefox to the default settings and reinstalled it. I checked the Windows Volume Mixer, but Firefox was missing from it. I hope someone can help me Thanks

Hello, when I open the Firefox browser from my taskbar it does not open as a full browser page as Image 3.

I have to click on the full-screen icon twice to get it open in full screen as in Image 4.

Please can you help?

Hey,

I've been having an odd issue with Firefox where tabs where I attempt to access youtube.com will immediately crash. This issue first arose when I attempted to log in to Youtube, and had never occurred before. When I did that login, the tab crashed, and I have been unable to access the website since (100% crash rate).

Basic details: The website does not visually load at all. However, the URL bar icons for the website do briefly appear prior to tab crash. (Autoplay button, etc). The crash is never reported in about:crashes.

I've tried the following tests, unsuccessfully: - Logging out of all Google accounts separately - Disabling all extensions - Transferring all of my data to a new computer - Reinstalling Firefox - Rebooting Firefox in troubleshooting mode

This problem does not occur on my Windows machine but occurred on my previous intel-based Mac and now on my current Apple Silicon Mac.

The only success I have had is in creating an entirely new Firefox profile. However, I would prefer to fix the issue, as I assume that porting all my settings to the new profile would... also probably bring the bug along.

Thanks for reading & any advice is appreciated.

I have many webpages open in many browsers and tabs. From time to time, FF locks up, and then the PC locks up, and the only way to resolve it, is to restart (eg: reboot) the PC.

every time I check a like on tiktok a window pops up requiring to move a puzzle piece to where it fits in order for the like to register a real pain in the butt that should not be happening PS does not happen with chrome

Greetings, all,

I get this error messsage:

<We are unable to complete your request. Our system is currently unavailable.Please try again later.>

when i try to log on to my USAA bank accounts.

Tech support at the bank worked with me for an hour. We changed password, cleared the cache for the bank's apps, restarted Firefox, restarted the computer, all to no avail. I declined to try Google, simply because i don't trust it. Tech support person said another bank customer had had same problem and just changed browsers, which i don't want to do.

TIA for any help.

You can see below my choices for - `1` for light, in `layout.css.prefers-color-scheme.content-override` - `0` for light, in `ui.systemUsesDarkTheme`. - "Light" website appearance AND theme().

But why some websites still darken and blacken background ? Examples are https://superuser.com, https://softwarerecs.stackexchange.com.

This mishap DOESN'T happen in Troubleshoot Mode. But I don't have the Dark Reader extension.

Cross-site Backup

When I restart my Windows 11 Asus ProArt PC or my browsers reopen, the positions of my tabs will shift around. Sometimes the last open tab will move into position one from wherever it was. Other times the repositionings seems random. I had an issue where I needed to reboot 3 times and in one of 4 windows a huge chunk of tabs repositioned in reverse order. I want certain tabs aligned next to others for my workflow. This doesn't happen all of the time if I have been in a window but it happens more often than not.

I have my browsers set up with Tab Session Manager to open one tab next to another. I also made a change a while ago to where if I type in a different website within a tab it will open within that tab instead of opening a new one. I only open a new tab if I want to.

I also find that despite having different sites having been opened in the same tab once I come back to a new session the previous tabs I'd opened there are gone and only the new one remains. That is less of a problem than tabs simply repositioning themselves wherever they choose. But if that is a clue to what is going on, there it is.

Hi,

There seems to be many Firefox processes running which consumes large amount of CPU and memory (attached) - I have only opened a single instance of Firefox however there seems to be problems with this. I end Firefox processes and start anew, however it appears the same. I restart the computer and open firefox it appears the same. I'm not sure whats going on. This is impacting my PC performance negatively.

Firefox uses too much memory, sometimes 20GB on a 32GB Windows machine. It's usually one or two threads which are hogging incredible amounts of memory. This time I had about 30 tabs open.

Today I tried Firefox about:memory "Minimize Memory Usage" several times, and it was largely ineffective.

I did a "create memory dump file" of one 5+GB bloated thread using task manager, but can't find a way to upload the compressed archive with this report for analysis. Finding a way to report this issue was quite a challenge. It seems most help avenues are now missing/moved, and other reports of this type of issue are "Archived".

I tried killing the 2 bloated Firefox threads and checked for tabs which might be missing or malfunctioning. Everything continued to run normally while more than 10GB of memory was returned to system use. Leaving these bloated threads overnight doesn't improve anything, in fact I can often get up and find my machine is completely out of memory because Firefox consumed it all. My smallest machines have 16GB RAM.

These memory issues aren't new. I've been reporting them off and on for more than a decade. They get better for a few months after reporting, then they get bad again in a few more months. The battle to get memory leaks fixed is continuous while Firefox springs more leaks.

I'd like to give you the memory image I generated so you'll at least have some real data to look at and analyze for this report.

The attached task manager snapshot image is a very minor example of this issue. The numbers keep increasing like there are one or more large memory leaks.

I have been having this issue with firefox for a while, where the developers options tab keeps opening up on its own, and closes on itself. I have attached a recording of the issue for better illustration. Many time I am unable to close it, it doesn't allow me to carry out my work when its up. My firefox is updated. Can anyone help identify what is the issue.

Ever since I downloaded the latest update on Firefox a couple of days ago, I have been unable to reach the internet. The program opens but doesn't show my opening screen and I can't get to any URL. At the bottom left of the screen, there is a message showing: Transferring data from . . . whatever site I was trying to access. The following message shows on the screen:

"Gah. Your tab just crashed. We can help! Choose Restore This Tab or Restore All Crashed Tabs to reload the page/pages."

When I click on Restore, the screen goes white for a few seconds and then the same message comes back. I downloaded the Mozilla software again but nothing has changed and I'm still getting the same messages. What can I do to not lose my bookmarks, etc.

Develop component <my-button> based on web component, enable ShadowDom, and apply <slot> slot to insert sub-component <my-button-item> that also enables ShadowDom, and set grid layout of component element <my-button>. Invalid subgrid property set for <my-button-item> element (By the way,the subgrid property in the <my-button> component is valid)

All items except but the top one (privacy) in the right-side menu in vimeo are partially hidden and so not fully functional. This problem does not occur in Microsoft Edge, and so it evidently is a Firefox problem. My system: AMD 3900X Running Windows 10 Home, Nvidia GTX950 graphics card, 32 GB memory, The image is a reduced-size screenshot from a 1920 x 1080 monitor. Adjusting the width of the window for Friefox has no effect on the problem.

Mozilla, this is unacceptable! You are letting this one domain crash my entire ShellUI.exe for twenty to thirty minutes. ACLJ It is trying to make runtime crash every program. What do you care? Note: Open the site in a sub-system. This is the only site that every crashes on any legal G. S. Windows 11. Will you do anything to fix this huge bug?

For the last couple of weeks, whenever I access the finance.yahoo.com/ website, my computer slows to a crawl. I run Activity Monitor to show me FF memory usage has surged to 6.5 GB! I cannot just 'quit' FF, have to force quit to regain the memory. No problems with any other website. I am running Mac OS 12.7, 8GB RAM, FF 102.0.1

Any help/suggestions appreciated.

Regards, Peter Donlevy