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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'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.

When I click on an email, instead of just showing the email, it sets up a Reply screen showing From me and To Me. At the bottom there is an alert: "A unique identity matching the From address was not found. The message will be sent using the current From field and settings from identity......" (lists my email user name and address). Im not clicking Reply, I'm just double clicking the message to Read it.

Running Sequoia 15.7.2 on MacBook Air. It just started today. I have turned it off and on, no change.

Since my Apple iPad was updated to IOS 26.1 (yesterday), I must continually apply a hack anytime I use Firefox to open and read any website.

What happens is once said website is open (for example, a thread in a forum that I have used for years or perhaps a news story (on The Guardian or Globe and Mail)), if I leave that tab for any reason (such as copying a sentence to paste in another open tab), the tab I am going to forces that thread to scroll up to the top of the page…and then returning to the tab that I copied out of, the same thing, the open thread scrolls back up to the top.

I am running the latest software version for Firefox and Apple.

This phenomenon began immediately after I updated my Apple to 26.1 from (IIRC) 18.x.

Thank you

I'm trying to add a second email account from my domain into Thunderbird and on the password test page I get an error. Of course the server exists, my other email account also uses it. How do I fix this or is this a problem with Thunderbird?

I am having severe problems downloading and syncing my emails with TB 142.0. I opened TB this morning, for example, and it took more than 20 minutes for it to download my emails. When I go to the next email, it takes a couple of minutes to load it. I have had some issues with slow syncing before, but this is very bad. I note that the emails work fine on my phone. Also, this happens on my main Gmail hosted account, but also on my other Siteground hosted accounts. TB seems to be lost in some kind of loop when syncing.

We have about 40 people still using Thunderbird with Exchange Online. One person is seeing many empty grayed-out folders and subfolders in Thunderbird. If you try to delete them, they come back. If you try to unsubscribe the folder, it comes back. They persist from client to client, computer to computer. Logging directly into Exchange Online using OWA does not show the folders. Unchecking "Show only subscribed folders" causes them to disappear." But they still show up if you right click on the account and click Subscribe. I have already opened a case with Microsoft and they say it's a client issue and not an Exchange Online issue.

Bonjour, A chaque fois que j'essaie d'imprimer un PDF sur Firefox, il me sort des pages complètement noires sur une brother DCP. J'ouvre les mêmes PDF sur Edge et pas de problème pour les imprimer. Le problème vient bien de Firefox qui envoie n'importe quoi via pourtant le même driver qu'Edge. J'ai vidé mon toner de noir avec votre bug.

As of 12/9/25, Firefox seems to now prevent Theme add-ons from working if there is a contrast setting configured in Windows configuration. (Version 146.0) Previously, this allowed a very aesthetically pleasing view. I would greatly enjoy having that option again. Thank you.