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I've been a long time supporter of Firefox and it's taken me a few years get all the bugs out of Win 7 so I'm not going to repeat that on Win X. My Win7_64 water cooled platform is overclocked, stable, and just as fast as most affordable new chipsets from Intel. I have third party security apps and firewall. I'm not downgrading to Windows X whatever later version that is and I'm considering other browser options, if anybody has ideas?

Although I'm on the ESR channel, I've been using User Agent Switcher for a while, which seems to work well on most sites. I also notice DuckDuckgo browser claims to support Win 7. I will miss Firefox, but switching to a Win7 supported browser would be my first option, then Linux if I have to dump Windows 7 for something else.

Developers will moan and say switch to Win X with the favorite phrase 'Upgrade' when my experience has been the opposite, but what do others feel who are using older versions of Windows?

I am using Thunderbird 140.8.0esr (64-bit) on Kubuntu 25.10 multi-monitor configuration. New install, very little customization.

Thunderbird will not retain the window size or position for the main window or messages. I have have tried deleting both the xulstore.json and session.json files (one at a time and both). When I delete the xulstore.json file and restart Thurderbird, it starts maximized. When I set the position manually e.g. to use about 90% of the screen for the main window and about half the width and about 90% of height for a message window and then close Thurderbird I can see the new window size vales written into xulstore.json e.g 2493 x 1362 and 1501 x 1317 "messengerWindow":{"sizemode":"normal","screenX":"0","screenY":"0","width":"2493","height":"1362"} "messengerWindow":{"sizemode":"normal","screenX":"0","screenY":"0","width":"1501","height":"1317"}

When I close and restart thunderbird it reverts to opening in the center of the primary monitor at a smaller size than when I closed it. The values in xulstore.json have changed to 960 x 540 "messengerWindow":{"sizemode":"normal","screenX":"0","screenY":"0","width":"960","height":"540"} "messengerWindow":{"sizemode":"normal","screenX":"0","screenY":"0","width":"960","height":"540"}

I found a similar recent question if this helps with a possible solution: https://support.mozilla.org/en-US/questions/1527783 but I cannot locate the referenced userChrome.css file to see if there might be something similar to try.

I am also using a multi-monitor setup. If I move the Thunderbird window to the second screen and close it, it always re-opens on the primary display at the 940x540 size. Thanks!

Von der Erstinstallation war ich gewohnt, dass von oben nach unten die Darstellung der Ordner wie folgt war: Posteingang / Entwurf / Gesendet / Archiv / Spam / Papierkorb / Local Folders /Postausgang / Unbekannt Nach der neuen Installation, die erforderlich war (Rechnerneuinstallation) ergab sich folgendes Bild von oben... Lokale Ordner / Papierkorb / Local Folders und dann alle meine selbst erstellten Ordner am Ende dieser Aufstellung kam die Zeile mit meiner web-Adresse xxxx.xx@web.de dann Posteingang usw. siehe oben aufgeführt Damit liegt der Posteingang am Ende meiner Ordner Auflistung und das ist über den unteren Monitorausschnitt hinaus, diese Situation ist für mich untragbar und deshalb werde ich wohl auf ein anderes e-mail Verwaltungsmedium umsteigen müssen. Eine Kopiermöglichkeit um die Ersteinstellung zu erreichen war kläglich gescheitert und jetzt ist das Durcheinander noch größer beste Grüße B. Bein

I was able to install it on my Mac mini running OS mountain lion with no problem but This is the error message I keep getting on my IMAC OS10.15.7 Catalina (attached): current browser is safari ver 15.6.1. Your help will be greatly appreciated!

The above topic doesn't really apply to this. There was no option for this problem.

Now, I use Firefox Relay to mask my email address. It has always been an icon on the toolbar. It has now disappeared. I would like to use it but can't without that icon.

Please help. Thanks.

Hello, Firefox. So I have this feature whenever I type. When I type my first letter, it is capital, and whenever I add an comma to my sentence and hit the space key, it adds an period. I don't remember enabling that feature, and I want to disable that feature. Is there any way if I can disable that feature? Thanks in advance!

Since the firefox upgrade of March 4, 2026, I have lost all of my old emails in my inbox. These are important items I need to work on before I complete and file away. I need to gain access to them ASAP. Thank you.

Hi!

I can't get messages from my Thunderbird account. When I click "Get messages" nothing happens and it usually says "Done" on the bottom left corner. I have to use my domain's webmail account to get my e-mail and it only allows me to read it and delete junk.

I really would love to have my Thunderbird account working again as soon as possible.

Thanks so much, Nancy Pedersen

Hello,

I have defined about 45 simple filters to get rid of spam. They are all based on keywords found in subject or sender.

All of them are enabled and set this way :

Apply filter when : _ Manually Run X Getting New Mail ( Filter before Junk Classification ) _ Archiving _ After sending _ Periodically, every 10 minutes.

Perform these actions : 1. Set Junk Status to : Junk 2. Move Message to : "super-junk" folder 3. Mark As Read

See example in attached image.

PROBLEM : They do not run automatically when new emails are received. But if I run each of them manually, they work.

QUESTION : What is wrong ?

Thanks !

I have downloaded Thunderbird from official Mozilla homepage. It seems to be installed correct. I got the icon and a question : should we start Thunderbird now. I answer yes. Then I get the message : Thunderbird is not found ? but I have just loaded it ? I am running windows 11 and I have got newest upgrade.

Hope you can help me out. Thx in advance. Regards Thorvald Antvorskov

PS I also have a PC running Linux Mint. Loading Thunderbird here was no problem.

I have made no changes to the PC or mail midway through the day it suddenly said input password, the password is correct, but I get incorrect password message. The password works using browser mode.

All of a sudden, i can not log on to my email accounts. I get a "failed" message for all 3 accounts. I get this message. Login to server mail.westpeake.com with username redacted@westpeake.com failed. Brian West www.westpeake.com

About once a year suddenly Thunderbird does not recognize my passwords for my two email accounts. I don't know why this keeps happening and how to get the passwords to work.

I keep getting pr_connection_reset_error messages in Firefox version 148.0 64 bit. I have purchased the windows 10 OS with extended updates and am running version 22H2 os build 19045.6937 do you have any suggestions on fixing this problem? When I am in my gmail account and using Firefox and I need to do a password reset that is when I receive the above error message.

hello,

I want to transfer my profile from an old laptop to a new one. i am not comfortable with uploading my passwords to the cloud as i do not understand how this is safe. i made tar.gz file with the entire profile, almost 1gb and put that on the new laptop. edited the profiles.ini and install.ini and expected the profile will load, but firefox simply does not work in that profile. it cannot browse and clicking the menu button in top right does nothing. Please, help. If I share data below that is the working profile, not the one that fails.