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I'm dealing with a properly updated 'bird: 140.5.0 (32-bit) running on an equally updated Windows 10 desktop. First thing this morning, out of nowhere, I started getting an "unable to write the email to the mailbox..." message when sending, thus I could send but not save. And then I realized I wasn't receiving either, on all three accounts in my Thunderbird. I stopped everything and focused on trying to fix this. It's been an all-day, losing effort. So far.

I tried the various quick checks and fixes recommended here and there: I'm running the program as an administrator. I restarted the program. I rebooted the computer. I think I have enough disk space, but to be sure I deleted some bloat from possibly overly large files. I compacted, even though the program is configured to do that regularly. I temporarily disabled my antivirus program. I went into my webmail and deleted all messages that have arrived since my Thunderbird stopped receiving, in case one of them was corrupted. And probably some other attempts as well. Nothing has helped.

And now a second, even worse issue has fallen from the sky. Thunderbird opens. The folder list is where it always has been. The number of unopened messages in each folder is there in boldface, as always, but...the folders are all blank and I get the dreaded popup: "unable to open the summary file...." Have I lost my years' worth of carefully curated emails?

I've tried folder repair. I've deleted parent.lock. Etc. Nothing. Nothing. Nothing.

I will be super-grateful for any wisdom sent my way.

Whenever I go back and forth between apps, there websites I have on Firefox gets reloaded. It is annoying and has been risky while on my banking website. This is why I have stopped using Firefox for any transaction related work.

I would like to change the authentication method to OAuth2, but it doesn't appear in the drop-down menu.

My Thunderbird version is 140.4.0esr (64-bit). I have all cookies set to allow.

How do I change it to OAuth2?

I'm running FF on Windows v145.0.1 and navigate to...

    https://www.star.nesdis.noaa.gov/goes/conus_band.php?sat=G18&band=GEOCOLOR&length=24

...and the animation doesn't work. This is a recent phenomenon. I have another computer in the office I've turned off FF updates (obvious reasons) and the animation works fine. It worked on my computer until recently. I'm so exhausted with FF updates that break things, it's getting as bad as Windows. I've run FF in troubleshoot mode, no good. I've added this primary domain to exceptions to enhanced tracking, no good. Nothing works so I assume it's Firefox (may not be). But v129.0.2 works fine, in this respect (streaming the animation loops of GOES West).

Does anyone know what configuration or setting I can explore to make this work again?  :-(

Thanks,

Been getting a bunch of this, usually in my TB TRASH folder, I think from the Outlook online server.

The server couldn't retrieve the following message:

Subject: "Stephen Tanner"

From: "Not available" ("Not available")

Sent date: 10/31/2024 2:25:02 PM

The message hasn't been deleted. You might be able to view it using either Outlook or Outlook Web App. You can also contact the sender to find out what the message says.

What does this mean? Outlook or Thunderbird? What do I need to do?

Hello. I haven't been able to find anything of the sort on my own, so i fear maybe there is no actual way other than doing it one by one. But, is there a way to add all of my currently open tabs in firefox android app, to my bookmarks (or collections, maybe), instead of having to select them one by one? Or, in its defect, a way to select all tabs, given that there seems to be no button to quickly select all currently open tabs? At this point, if anyone knows a firefox extension/add-on that works on mobile that could do that, i would deeply appreciate it.

Thanks in advance, i just want a way to not have to select my 100+ open tabs by hand since it genuinely seems like a waste of effort for me and i would rather spend that energy into migrating to another browser altoghether.

I have been dealing with an issue in Firefox on Windows 11 for several weeks now hoping for a fix soon but it has not come yet. When I am browsing on eBay, it will lock up and I have to identify the thread in Task Manger and kill it (just the runaway thread, not the entire program). I can then continue of eBay for a short time before it happens again. This only happens on eBay while just browsing, not bidding/buying. Is anyone else having this issue?

At startup of Thunderbird, get error related to Outlook which I do not use. Get message - "UserHasNoMailboxandNoLicenseAssignedError"

How do I get rid of this error, has been present since last esr release and expected it to go away with new release - did not. Do I have to reinstall Thunderbird to clear.

I would like to find out why Firefox withdrew $47 from my PayPal debit account. What was it for, I cannot find an invoice or and explanation for the transaction. Please contact me and explain the reason you charged me, I don't remember authorizing you to access my PayPal account although I have made some contributions to Firefox and may have used PayPal to do that.

With Firefox 144, there is unasked for/unwanted AI introduced. How do I ensure that all AI is completely disabled in my browser? I found a link describing some settings, but want to confirm this will disable ALL AI in the browser. I don't want it, don't trust the privacy/security holes yet to be found and would prefer it was not included in Firefox to begin with. The list I've found is:

• user_pref("browser.ml.chat.enabled", false);
• user_pref("browser.ml.chat.menu", false);
• user_pref("browser.ml.chat.page", false);
• user_pref("browser.ml.chat.shortcuts", false);
• user_pref("browser.ml.chat.sidebar", false);
• user_pref("browser.ml.enable", false);
• user_pref("browser.ml.linkPreview.enabled", false);
• user_pref("browser.ml.linkPreview.optin", false);
• user_pref("browser.ml.modelHubRootUrl", "");

Will this do it? What about:

browser.ml.chat.nimbus

Do I need to clear that field to ensure I don't get some auto opt-in in the future as more and more of this "stuff" is put into the browser?

Why not leave Firefox as a security/privacy conscious browser and put out a separate AI browser (FirefoxML?) for those that are not as concerned. How does Mozilla ensure that no information is leaked through AI from sessions for professionals that must protect physician/patient, attorney/client information or other legally confidential information?

I need step by step instructions in order to make the changes that Mozilla/Firefox wants me to do. I have also been having medical issues which is affecting me mentally. Right now I am totally confused, and I don't know what to do.

Hello:

My Windows Thunderbird has become unresponsive, taking forever to connect to my various accounts. I suspect the problem is with my GMail account--which is not my primary account--is causing the problem, but I am unable to un-sync GMail's All Mail folder.

I was able to get into troubleshooting mode, but TB was still unresponsive.

I have copied the profile in question to my Linux machine, with TB V140.4.0esr, to try to repair the profile, but the problem is recurring there as well.

Is there a way to manually edit the profile file(s) to remove the GMail account from Thunderbird?

Any insights would be much appreciated.

Thanks

DrP

I am able to receive emails with my Spectrum account but unable to send. My SMTP entries are Description Server Name mail.twc.com port 587 Connection security SSL/TLS Authentication normal password When I test the connection it passes and I can see my emails but am unable to send emails and get this message Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) mail.twc.com failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again. When I look in the Thunderbird settings/privacy and security the only password entry is for IMAP password. Do I have to have and entry for SMTP password or is it the same for both? If I do how do I get an entry there. If any other information is needed please let me know. Thanks

I sent message below to Bluesky support and have tried all their suggestions (all relating to Firefox), but to no avail.

MacBook Pro OS 10.14.6. Yesterday (9Dec2025) I could open Bluesky & see my profile but could not add a new post. I then did an ‘age verification’ and received confirming emails. When pressing ‘New Post’ button just went to blank page. Under ‘notifications’ at the top, was a message “''''! r.countGraphemes is not a function''''”. I am accessing using ‘Firefox 115.31.0esr (64-bit)’. I have deleted caches, re-started ‘Firefox’ and re-signed into Bluesky, but problem persists.

Could you please advise how I can overcome this problem. Thank you, best regards.