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Will this fricking "The bookmarks and history system will not be functional" B.S. ever be fixed? Firefox didn't have this issue for years now for almost a year every time Firefox starts up on a cold boot I get this idiotic non-sense message!. I have to close the browser I JUST OPENED and reopen in. This error is pure B.S. as again cold boot, just launched there is NOTHING other than Firefox that might be accessing the various sql.db's...so if this message is to be believed Firefox is blocking Firefox from Firefox... FIX THIS!

Third Contact. A few questions in hoping to resolve this on-going issue of Firefox 144.0 crashing on my iPhone.: What is GitHub … never heard of it? Why should I trust it. How is my privacy secured? Why do I have to go to GitHub for a Firefox issue? What is Xcode? How do I get it? How do I connect to it? After many years with Firefox why is this happening? Can I back grade to the previous Firefox? As a long time Firefox user and Mozilla donor a worse case option is for us to scrub FireFox from all of our systems pending Firefox issuing a corrective up grade.

Hello. My tablet, has limited memory, due to its age. I am now finding that one of the main reasons why it is so slow is because whenever I open firefox, it opens multiple firefox processes which drain the memory and in some cases crashes the system. I have followed all the advice given to reduce these multiple processes, however nothing seems to work and at least 6-8 firefox processes open each time I open it. I have unchecked the recommended performance settings as well as hardware acceleration boxes. However, I cannot find where to set the content process limit to 1. Please tell me how to do this and if there anything else I can try to stop it opening multiple processes or I may be forced to ditch Firefox altogether for an alternate such as Bing, Chrome or DuckDuckGo. Many thanks. Charlie

Firefox stürzt seit einigen Wochen immer wieder ab.

Auch ist es sehr langsam, oder lädt die Seiten nicht.

Auch kann ich nichts schreiben, zwischendurch.

Es nervt!

Und ein neues Update gibt es nicht.

Wenn es so weiter läuft, muss ich einen anderen Browser nehmen, was ich gar nicht möchte, da ich Firefox, seit Anfang an benutze...

This has been consistent for over a week now. One folder brings TB to a halt if I try to open any message in it. I have many folders and many I rarely open so I can't be sure it's just this folder but certainly all other folders seem fine and fast. This particular folder did have many messages in it but I deleted them all, accepting that I didn't really need them. I then repaired the folder but was a bit shocked to find the problem continues. The folder says it is 20.9Mb and that it contains three messages each of 7Mb. That's plausible as it just gets one Email per day from my server with some information. The size can vary quite a lot. I could just delete the folder and recreate one with the same filter rules, or I could delete the filter rules before doing that, or ... what?! Technical is that it is TB 140.3.1esr running on a fairly powerful Kubutu machine with 64Gb and really nowhere near any resource limits. It's pulling messages from the one IMAP server and, as I say, everything else seems fine. Any thoughts welcome, TIA, Chris

When I use Firefox to go to a url I have about 5 second max then it crashes. I’m running Firefox 144 on iOS 26.0.1. My wife is running Firefox 143.2 on iOS 26.0.1 and does not have this issue. Thanks. Mike

I use Thunderbird on Windows and on Mac. I'm wondering why the startup time on Mac is significantly longer on MacOS. I'm currently on Tahoe 26.0.1 but Thunderbird has always been a slow starter. Can I change any setting to remedy this. At the moment I have two mail accounts configured both Gmail.

I have nothing but problems with firefox since the last new updates. Sites hang, gmail can't be accessed, it takes 100x longer for sites to load, firefox uses huge amounts of memory and CPU, etc, etc.

I am so fedup spending valued worktime having to solve firefox issues each time they decide to make updates - which seems to be more and more frequent. How can I roll back to a previous version and permanently disable any further updates?

Each time I click on Firefox from the Windows 11 Task Bar, multiple versions of Firefox appear in the task manager (see photo). Some have an icon next to them that says "efficiency mode".

The attached screenshot is what I got from loading Firefox to ask this question. Multiple scans of my computer using Norton 360 -- including the Startup Scan -- have found nothing awry.

The operating system is Windows 11 Pro Edition Version 24H2 (OS Build 26,100.6584.) Firefox says it is fully up to date.

local folders after a certain amount of folders have disappeared. I have made a new folder today, it displayed, closed thunderbird, re-opened thinderbird, and folder disappeared, the .msl file and file are still in the profile/mail/localfolders directory, just not being display under local folders in program, deleted all .msl files, and restarted thunderbird, and it did not recreate the .msl file(s) as well

When Firefox ver. 143.0.4 (64bit) is opened, I see many tiny groups of black dots withing the whole of the desktop display of this Firefox. From these black dots I see coloured lines traveling across the desktop within the Firefox desktop display. As I move the mouse these coloured lined move, disappear, and move around. Can you offer any suggestions. I am using Ubuntu UALinux Gamepack 22.04, The version of Firefox is an upgrade provided by Firefox updates. I have tried to uninstall this version of Firefox, same effect occuring. I have manually deleted every referance to Firefox, as this worked in UALinux Gamepack 20.04. I have used sudo apt update, sudo apt upgrade, sudo apt --fix-broken install, and sudo dpkg --configure -a. None of these can fix this problem. I restarted my Firefox today with the same problem, and found in the Help dropdown menu, and found troubleshoot mode. When I opened in troubleshoot mode, all these problems are not there any more.

Can you offer any help ??????

P.S. I tryed to take a screenshot of this problem, but the screenshot doesn't show this problem ?

I have only 4GB RAM and that can be an additional factor that causes this issue. When I listen to Youtube Premium in the background (with video window hidden) and switch to Firefox, Youtube Android App is killed. Same thing happen with Youtube Music from time to time. For Youtube, I can workarund this issue by keeping video in Picture-in-Picture (PIP) mode.

On a new tab in Firefox Focus for iOS 26, the floating keypad first appears, and once Dragged to bottom to make the full keypad, it glitches, erases what I wrote, and brings up floating keypad again. I know this is a beta and has bugs, this is just FYSA for iOS 26

Thunderbird very slow to respond when opening the program. On opening any email it freezes for a couple of seconds resulting in a "Wait for the program to respond" or "close program message" . This also happens when performing any action in Thunderbird. This has been happening for the past two or three weeks. Can you tell me how to fix this or is it something you need to do to fix.

Hello. The Thunderbird on my MacBook Air is extremely slow and slowing down the other applications. On the other hand, Thunderbird works perfectly on my iPhone. What can I do?’

My thinderbird was getting stuck and it was rebuilding the indexes continuously and it was super slow. I deleted the msf files for inbox, sent items and archive and it was became very fast for 3 days. Since yesterday it is again rebuilding the indexes of inbox, sent items and archive, and it is very slow. See screenshot. What should i do? Chatgpt mention that it would be something about the file global-messages-db.sqlite. Should i delete that?

Dear ∀, My Thunderbird on Mint often freezes. How can I find the problem source? Is there a guideline for this? You can find my system information at https://termbin.com/s0hx The (slightly modified) output of Hilfe→Informationen zur Fehlerbehebung can be found at https://c.gmx.net/@357082100660175185/U-IvRdfnd1PpRzQdi7Pyxg until 2026-09-26. Thank you in advance for your help.

My file named "Archive" (no extension) in the ImapMail\outlook.office365.com\ folder is now 3 GB. I like all my inbox email progressively be archived in a single archive folder, searches are easier (in do not need to tick off "search subfolders" when I do Edit -> Find -> Search and I select the Archive folder. But I was wondering: does this affect speed (speed at which chunk of emails are archived at once, search speed etc) ? Should I archive by year? If it makes a big difference, how do I get thunderbird to get everything moved in years folder? If I select "yearly archived folder" in the attached screenshot, is it gonna start archiving by year from now on but it leaves the old files in a single folder, or does it creates also the yearly older folders and split all the past emails on those folders?

I opened a new Firefox session (closed the previous one properly using the “Exit” option, without force-killing it) and had only 4 tabs open:

One YouTube video at 1080p One bookmaker site that may have a 240p video playing Two Flashscore tabs (static pages, no video)

When I end all firefox.exe processes, the Task Manager shows that about 10 GB of RAM is freed.

How can just four tabs be using that much memory? Please help me with this issue.

Thank you!