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Hi. I have over 20,000 messages in my Inbox. I've been sometimes having trouble moving messages into folders, so I thought it would be a good idea to reduce the number of messages in my Inbox. But I can't delete or move messages in the Inbox. When I select messages and enter command to move them to a folder, or ask to delete them, nothing happens. I am a Thunderbird supporter, and I love this program. Thanks for your work! Any advice appreciated. Connie

Hi!

When I click on an Email in the Email-list it will not open in the Mailwindow. Also it will not be marked as read. Same thing with doupleclicking the Mail. It will open the Mail-Tab but it is empty and the Mail is still marked as not yet read. New Mails are downiaded and appear in the Maillist. I´m using Thunderbird 141.0 in Windows 11.

Help...!!! ;-)

Hallo,

Ich nutze Thunderbird seit Jahrzehnten. Nun ist mir zum zweiten Mal etwas passiert, das zum Verlust meiner eingehenden E-Mails geführt hat. Ich habe die Komprimmierungsanfrage bestätigt, und danach war der Sendeordner leer, und die Daten eines Jahres waren weg. Eine Reparatur ist nicht möglich, IMAP-Konto. Letztes Jahr passierte dasselbe, E-Mails von vor 10 Jahren waren verschwunden, nur im Sendeordner. Alle anderen Ordner sind in Ordnung. Was ist das Problem? Nie wieder Komprimierung zulassen? Das ist unglaublich ärgerlich. Viele Dinge sind unersetzlich. Wie kann ich das in Zukunft verhindern? Warum betrifft das nur den Sendeordner eines Kontos?

Freundliche Grüße

Wolfgang Nolte

When starting a New Message I start typing the recipients name, but Thunderbird stops at the first letter of the name and takes about 20 seconds to respond before bringing up a list of correspondents.

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.

Firefox kept eating my RAM, running dozens of processes. I have gone into about:config and set the dom.ipc.processCount to 1 - then I restarted Firefox and found 5 processes running straightaway before even using the browser. I closed it down and have started it again and now there are 11 processes running with just one tab open. Firefox(9044) Utility(7552) JavaScript oracle Network (15912) Data Decoder (11364) GPU (18744) About pages (12536) Preloaded new tab Extensions (20544) Preallocated (16132) Preallocated (13780) Preallocated (16044)

The problem repeats on three different computers which are not infected with malware. One computer with slightly less RAM I now cant even use Firefox at all (though all other browsers work fine) because the tabs constantly crash due to the high number of processes. Is there any way to set the process limit low in a way that Firefox actually responds to?

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 left a review and was asked to post this here so here goes. Firefox on android is currently the highest user of power on my Google Pixel 8 android phone. From the battery usage data (since last full charge) Firefox has used: Screen time: 2hrs 33mins Background: 5hrs 46mins Totalling 19% battery usage. Even though I turned OFF allow app to run in background!! Before I turned this off, the battery usage was similar. In comparison: WhatsApp -the next highest- is: Screen time: 1hr 42mins Background: 17hrs 52mins Totalling 14% battery usage. With allow app to run in background ON.

The only thing I can think of causing this is the annoying (in my opinion) way that Firefox does not close down all open tabs when I close the app (by hitting the square control button and hitting clear all open apps button) are they still keeping Firefox running in the background as they refresh?

PLEASE add a setting to close all tabs when closing the app. When I close Firefox on my PC and then open it again, I don't get my old tabs, so it must be possible to do on android.

Hello,

same issue as described here: https://support.mozilla.org/mk/questions/1487230 I use: 144.0.1 (aarch64) on macOS 26.0.1 (25A362) (MB Pro M1 Pro).

This morning I updated Mozilla Thunderbird to the latest version, see attached image. When I open Thunderbird for 20 seconds I only see a full screen white image for at least twenty seconds, then the program starts normally and everything seems ok. In previous versions it never happened 100%. There is definitely a bug in this version. Hopefully we will have an update soon that will make everything okay again. I have been using this software for years without any problems, until now. Thank you. Rossano Zanga, SUI.

Every 1 - 2 hours Firefox stops loading pages and I have to shut it down and restart it and restarting takes around 6 clicks on the icon to get it to start.

Also one time today I lost all my pinned tabs and had to manually restore them one at a time.

Using Ubuntu 24.04.2 and latest Firefox. Cleared cache but doesn't help.

I AM SENDING TWO SCREENSHOTS IN ORDER FOR YOU TO SEE WHY I AM SAYING GOOD BYE TO FIREFOX OVER 4000 OF RESOURCES AS YOU CAN SEE AND FIREFOX HAD 4 TABS OPEN ALL OF THEN JUST OPENED UP SO THEY WERE NOT YET CONNECTED TO ANY WEBPAGE.

I CANNOT SPEND HOURS TRYING TO FIX THIS

SO I AM MOVING TO ANOTHER BROWSER

I JUST WANTED TO SAY CIAO

Performance manager always seems to have a green line doing something

Always indexing/sending - mention of 11,000 messages etc etc

Determining which items to index in Sent....

Is this using resources unnecessarily ?

Thanks

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

First time using Thunderbird 143.0 (64-bit) on MacOS Sequoia 15.6.1. System is a MacBook pro 2.4 GHz 8-Core Intel Core i9 with 64 GB 2667 MHz DDR4.

Installed Thunderbird. Added a fastmail.fm and icloud.com account. Fastmail account is 14GB account. icloud is 50MB.

System is continually pausing during use and the mouse turns into the rainbow spinner. Application recovers after a second or two but it's annoying that it happens.

Thunderbird ActivityManager shows that indexing is not in progress. MacOS ActivityManager shows that CPU for Thunderbird going up to 100% during these periods.

Aside from the pauses, Thunderbird is stable and does not crash.

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!

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!

I am running Firefox on Windows 10 64-bit, and I have lots of windows and tabs open. Occasionally I will get a message from Windows that I am running low on disk space. Recently I got the message, and I saw on my C-drive" "336,044,032 bytes free". After I did an Exit in Firefox, I saw "10,082,402,304 bytes free". The space that was freed was in the pagefile.sys file. Is this normal?

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