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Important update! On March 14, 2025, a critical root certificate in Firefox will expire. If you’re still using an older version (before Firefox 128 or ESR 115.13+), it’s crucial to update to Firefox 128 or newer to avoid issues with add-ons, DRM-protected content, and other features.

For full details, check out Update Firefox to prevent add-ons issues from root certificate expiration.

If you have questions about the update or need help with the process, this is the place to ask! Whether you’re just starting or you’ve already updated and want to share your experience, we’d love to hear from you.

Let’s come together, share tips, and ensure we’re all prepared. Drop your questions or insights below!

I regularly have a difference in the number of emails being downloaded and the number of emails that appear in my in box. For example, this morning when I logged in it said that two emails were being downloaded and yet none appeared in my in box. I have never been able to locate a spam folder. Where are these emails going? Thank you. Dave D.

Ich kann leider kein Englisch. Mein Problem: Ich möchte meine Gmail-E-Mail-Adresse in Thunderbird aufnehmen, bekomme aber immer eine Fehlermeldung (siehe Bild). Ich verstehe das nicht. Ich habe alles probiert; Google aktualisiert, Zugriff zulassen etc. Nichts hat geholfen.

see attached. When I right-click on the sender's name, nothing happens . . . .

[also, when I "browsed to get the file to attach, your system ignores all .BMPs. Very frustrating. And, why not allow us to drag an image?]

Hi : We are planning out server farm capacity, network gear needed, for a new site for our AI micro-services. We are curious when do you think that Firefox will support TLS 1.4 ? and will the overhead/utilization difference be between TLS 1.4 and 1.3 which we currently use exclusively. I understand that we are talking servers, and FireFox is a browser, but we cant dig up any real-world stats on the workload difference between the two. Any help would be appreciated.

Thank you for your time Albert Baker.

Now it's completely impossible to open PDFs outside Firefox, as I could do until the last couple of beta versions.

This trend is going on since a few years ago, from bad to worst. The whole design of the PDFs download process is bad. PDFs should be treated by FF as any other file: download and open with the system default PDF viewer. Imposing Firefox's internal PDF viewer as mandatory for downloaded PDFs is nonsense.

thunderbird est un tas de bugs de plus en plus inquiétant j'ai plusieurs milliers de mails absolument vides dans thunderbirds mails vides inaccessibles impossible à enlever pas de destinataire pas d'expéditeur pas de sujet taille à zéro 0Ko date annoncée à 1971-01-01, 01:00

je fais comment ?

merci

Dear Sir We had recently installed fire fox, trying to import outlook data for same POP account with same password, but firefox showing importing data folders also created, but no progress seems. can you suggest some solutions.

thanking you

Ich konnte unter "Posteingang" Unterordner anlegen, um E-Mails darin zu verteilen. Früher konnte man dieselben Unterordnernamen auch unter "Gesendet" erstellen und ich möchte das auch wieder machen. Wieso wird das nicht mehr angeboten? Gibt es einen Ersatz?

I am about to lose access to Outlook. My current settings show imap.mail.yahoo.com and smtp.mail.yahoo.com and it is working. This is an sbcglobal.net account. When I look at what ATT says it should be due to changes they made it reflects imap.mail.att.net and smtp.mail.att.net. The ports are the same between both choices. It says on both of these when entered that it can't access and the user name or password is incorrect which is not the case. Any help out there???

Thunderbird, quite suddenly, stopped getting my email; Both on my account and my wife's account at the same ISP. I spent more than two hours on the phone with the ISPs help line trying to resolve this issue. They also use Thunderbird at their help desk, and the agent I talked to was familiar with your program. She (the agent) was not able to replicate the issue on their system. We then tried to set up a NEW email account. I carefully entered all the info needed for a new account, following instructions from the agent, then hit the 'Test' button. I got the following message onscreen: "THUNDERBIRD FAILED TO FIND SETTINGS FOR YOUR EMAIL ACCOUNT" The answer to the original issue suddenly became very clear - Thunderbird cannot, or refuses to, connect with the email server, therefore NO EMAIL. We tried everything in her toolkit to resolve the problem to no avail. We finally tried UNINSTALLING Thunderbird (and the Maintaince program). Once Uninstalled, I used the Registry Tool on CCleaner to remove any entries in the registry referring to Thunderbird (there were several), then restarted my computer. I then downloaded and installed a totally NEW Thunderbird program. When I ran the Thunderbird again, I found all my account(s) info was still present, and Thunderbird was still unable to find the server. I'm at my wits end trying to resolve this issue, and REALLY HATE to go back to Microsoft OUTLOOK to get my email. Anybody got any ideas??? Any help would be greatly appreciated. (Signed) Proteus

Thunderbird freezes on loading. It seems to be working (window notifications show incoming mails). The top bar has one item which says "loading" but never does! I am running WIN 11 pro with AVG. I have tried the following: - open TH in program safe mode - Open TH with laptop in safe mode - uninstall and reinstall - Open with antivirus turned off - Deleted all .msf files in current profile (judging by time and date) which seems to have been called xxxxxxxxx.repair . On restart TH did not reinstate the .msf files and the blank frozen screen was still there. - there were about 4 other profiles in the directory although in reality there should only be one. These profiles have various names: defaultnew, default (2 off), default-release and repair. - All profiles except the one with ".repair" were copied to another location before restarting. Any help would be appreciated.

recently i am having problems with sending emails from my desktop, via thunderbird. it keeps asking me to sign in with my new password. however i have not changed my password with virgin. i can send an email from my phone, so i know its not virgin. i have spent 3hours reading up and checked the server and outgoing settings, and changed switched adjusted what i could see, and set them back to the original settings, which in effect meant i have done nothing, and all of a sudden it works again. this did happen a couple of week ago, so not sure what's going on, and i really haven't got a clue what im doing, so any help or advice would be appreciated.

After I've successfully logged in, why does Thunderbird continue to indicate my login has failed and asks me to login again, repeatedly? Do you know how I can fix this?

I have been having much trouble with Thunderbird. The latest problem is with the Sent folder. When I try to Compact Folders I get the message "The folder 'Sent on Local' could not be compacted because writing to folder failed. Verify that you have enough disk space, and that you have write privileges to the file system, then try again."

I have plenty of disk space and have Full Control. I tried creating a temporary folder and moving all the Sent messages to it, so that Sent had zero messages. I still got the same message. The file listing showed Sent to have a size of 182 MB even though it didn't contain any messages. I've tried deleting sent.msf to force Thunderbird to recreate the index - didn't work. I tried using Repair Folder. That worked, but when I tried Compacting Folders again it found another folder with the same problem. I fixed that one and then it said the Sent folder was bad once again. I'm going around in circles!

I've deleted and recreated scores of .msf files for various reasons, trying to get Thunderbird to work without errors, but as soon as I get one problem fixed, another one crops up. I'd conclude that it's my computer, except that I'm not having any problems with other programs.

Any thoughts on this particular problem or Thunderbird problems in general? Thanks.

This is 3 time I have lost almost half of my apps while using Firefox. I just lost Firefox and alot of apps and don't understand how this can keep happening? I don't know which one's I lost or how to get them back? Very important to get those back. I pay my bills with some of them. Please help. I had to ad Firefox back to even do this

Something has changed in the way Thunderbird is handling Replies. Replies used to be added to the original email with an arrow indicating that the email had been responded to. Now the reply is added to the mail list as a separate email grossly clogging up the list of emails. Sometimes the "replay arrow" is displayed and sometimes not. I do not want the reply shown as a separate email. Is there some setting that will accomplish this? I have been unable to find anything that looks like it would work.

PS The Bold and Italic for this email did not work.