All Products Community Forum

Since recently 1~2 version, my Firefox keeps consume large amount of memory and release it repeatedly

Even I restart Firefox and do nothing, it will start doing this again

I use about:processes and about:memory to capture this seems the main process's "tab.query" causing this, please check

PS: sometime it will consume till system max (64GB) and cause my OS out of memory. PS2: that wave-like memory usage is cause by Firefox

I am moving thunderbird account to a new computer. After downloading and getting to login screen, I click 'done'. The programme only starts to re-assess/re-test the config. This happens whether manual or automatic configuration is chosen. When I click 'done', it only goes to find the config again. It does not begin importing the profile/account/emails.

I waited a few times ... so it could download the emails/profile/account - nothing happens. No 'progress bar' appears.

How do I get the programme to begin loading on this computer? Thank you in advance

As of July 1st I'm unable to open www.funnyjunk.com on firefox I can do it through chrome or a 3rd browser on my phone and a friend who uses firefox can do it too. I have DNS over HTTPs settings disabled, troubleshoot mode and private window didn't change anything. Afaik I haven't installed anything new between my last successful and first unsuccessful attempt.

Recently I noticed that in ALL of my Local Folders, I can no longer see any of the content. The headers show like normal, but I cannot open / read the content (presumably contained therein).

I have tried repairing individual folders, but nothing changes.

I have tried eliminating the .msf file, but nothing changes. A new .msf file is created, but the content is still not visible.

If I try and reply to a local email, the email is empty with the exception of the subject. Even though it shows the sender of the email (i.e. From), neither the email address nor the email content is copied into the reply.

I am slowly starting to worry that the individual files storing the email content are corrupt, but if I open the content file (i.e. non-.msf file) with Word, I get what I presume is the first / oldest email, but nothing more (even though the files are many MB large).

Is it significant that I have both "Local Folders" and "Local Folders.sbd" (as folders)? The content within them appears to be similar if not identical.

My email is stored on a NAS which I can access from any computer on my network (presuming I have set up Thunderbird appropriately); can this contribute to the issue?

Any other ideas which might lead to such an annoying issue? I really don't want to have lost all my emails for the past 20+ years.

Thanks in advance for any suggestions you make.

Suddenly they broke after the 140.0 update, but as it turns out, this is the case everywhere. Does anyone know what the problem is?

Verified on: Firefox Desktop, Chromium Desktop, Firefox Mobile Font: Calibri (No changes), Roboto (No changes) I've scoured half the internet, as if I were the only one with this problem...

I shop on several websites, and the customer review section does not appear on the product pages. Thinking extensions may be to blame, I tried opening those particular websites in a new private window. But I still was unable to see the reviews. It works fine on Edge. Is there any way to fix this?

I receive email fine. The website email works fine. I cannot send email via thunderbird and have not changed my settings which worked for years. my smtp account. I have rebooted my Windows 10 pc numerous times. What can do this? How can I fix this>

I'm trying to go into my work place drivers only webb site And the stupid GoDaddy thing keeps blocking me!!! Why am I being blocked from site I have book marked??? I don't want the stupid GoDaddy blooming me!!!

When I use Mozilla's VPN service...many mozilla vpn servers will block me from sending out emails giving this error message:

Sending of the message failed. An error occurred while sending mail. The mail server responded: Service unavailable; Client host [23.234.88.xxx] blocked using clients.rbl.e-scout.net; host 23.234.88.xxx blocked due to abusive behavior from your network. Please contact servers@ispn.net for resolution.. Please check the message recipient "xxxxxxx@xxxxxxxxx.com" and try again.

Mosilla's VPN service is blocking its own Thunderbird software from functioning...lolol Are you going to fix this Mozilla??? Looks like you're tripping over your own feet...

starting at the update before the most recent one (currently june 30 2025) my firefox browser on my windows 10 pc simply doe not work at all. i am surprised it actually loaded the support page allowing me to write this, but every other page i try to open gets stuck in infinite loading. next thing i am going to try is uninstalling/reinstalling I GUESS. firefox on my other PC and phone are totally fine. is this bc i am running windows 10? please help :C i installed chrome and its absolutely awful

I have a few passkeys saved in Proton Pass password manager. I can use them with any browser on any OS using various official browser extensions or applications. For Firefox, I use the proton pass extension (https://addons.mozilla.org/en-US/firefox/addon/proton-pass/).

The passkey for my Nintendo account doesn't work with Firefox. I tried with Firefox 140 on a Windows 10, on MacOS 15 (Sequoia) and on Linux (Ubuntu 22.04). Same problem each time: error message "couldn't complete passkey sign-in" (see the attached screenshot).

If I use the same passkey stored in Proton Pass with another browser, it works. I can log into my Nintendo account. I tried with Microsoft Edge on Windows 10 and on MacOS, and with Safari on an iPad.

It seems the issue is also related to the Nintendo website. I can log without problem into my Sony account (https://store.sony.com) using Firefox 140 and a passkey stored in Proton Pass.

Although I have successfully logged in many times, I get an error message today: An error occurred during a connection to b2clogin.firstenergycorp.com. PR_CONNECT_RESET_ERROR Error code: PR_CONNECT_RESET_ERROR

Secure Connection Failed

An error occurred during a connection to suneethi.sjd.kerala.gov.in. PR_CONNECT_RESET_ERROR

Error code: PR_CONNECT_RESET_ERROR

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

Learn more…

Have been unable to access Firefox for a couple of months (have been in and out of hospital so not critical at the time). I now find when attempting to access that I get as far as the two top lines of the screen coming up, but then a message saying no message found. I know that there are messages there, also my addresses and folders. Please note that I am a very basic user, so any instructions will have to be spelled out. Thanks

Hi everyone, I use Firefox as the main browser for my iMac (Sequoia 15.4.1). Recently, Firefox has been incredibly slow. I'm able to boot up and open Firefox (140), but when I search for something or create a new window, it never loads. Is there a way to fix this? I can open the same websites on Safari, but Firefox is my employer's preferred browser. Additionally, my bookmarks are all saved on Firefox. Thanks for insights/ideas/solutions.