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Hi,

I just cannot find any information on how Thunderbird designers see the Threads / Threading features to be used. How would I use it ? What are my (individual) choices for configuration ? etc.

The only info I can find is : [how to manage and turn on/off the feature].

...and of course lots unhappy user voices across the forums.

So: How would I use it ? What are my (individual) choices for configuration ? etc. Please link the respective Mozilla resource (blog, help, user design doc, ... whatever).

Ah, to start with, a description of how the feature is meant to behave, can be a start. (Sorry, I was just too stupid to find that)

Windows 11 Pro on Lenovo ThinkCentre. I switched to ESR a while back, when the regular and ESR versions coincided. All updates since then have worked fine, until now.

When I allow Firefox to update to 140.3.1esr from 128.14.0esr, then the Firefox browser no longer works at all. It comes up, but entering a URL (by typing or bookmark) does nothing and goes nowhere, so I can't use the internet at all.

I had to use Macrium Reflect to restore my system drive to an earlier time to get back on the internet, using version 128.14.0esr, which lost some recent bookmarks, etc. I have tried this twice, with the same result.

Now, a couple of sites no longer work because they say the browser isn't current.

What can I do about this? I hope I don't have to switch to another browser, because there are Firefox extensions I use all the time. However, I can't use a non-updatable browser indefinitely, because more sites won't work.

Can I fix this?

Thanks for your help, AnneF

hello the flatpak update command tells me that the runtime is eol and its used by the flatpak thunderbird. can you please update the runtime soon? i add a screenshot of the issue, its in german. please review this as fast as you can please greetings oski

Need to separate the system info. strip with time, date, and battery on top which is overlayed on the horizontal bar with browser tabs. Problem came about after update to iPadOS 26

I am able to save tabs to collections. However, there is no collections section on my homescreen, despite support articles and questions indicating it should just be there. When I turn shortcuts and stories on, they still do not appear. How do I make collections show up?

Hello, I sent the message below last evening and someone named "Ed" replied. Thank you Ed. When I tried to "reply" to his/your question/email, I immediately got a bounced back email as "no-reply@support.mozilla.org" could not be found. Also, in my original question I said that I'm not "computer illiterate"; apparently I am as I don't know how to reply to his question. Please include info on how I can respond. So, I'll start all over by sending my original question:

Hello, Attached are the messages I have been receiving ever since 6 October 2025. I've tried to read about fixing these myself, to no avail. (I mean, I can Read; I just can't fix this.) I've tried to Compact ALL folders individually. But that seemed to do nothing. (Before 6 October, the Thunderbird window would at least "flicker" a little after compact.) Trash is empty. Tried disabling McAfee AntiVirus & Firewall. And, no, this isn't happening because I'm using McAfee; I've been using McAfee since Windows XP and Thunderbird since before it "broke away" from Mozilla. They have, until 6 October, played nice together. I really like Thunderbird so I do not want to find another email client/program/what-have-you. There are LOTS of saved emails that I cannot move/copy to "save space", so...Help? Please?

Thanking you in advance, tonyg

P.S.-I am not computer illiterate. But, slow, easy to follow, non-BIOS changing, step by step directions would be preferred.

Greetings! I read everywhere that we must install the Lightning add-on to use the calendar feature in Thunderbird. But when I search for this add-on, I get a bazillion options, none of which appears Lightning. There is something called Lightning Calendar Tabs that keeps coming up. Is this it? Doesn't seem so.

Where can one download/install the Lightning add-on?

Thank you.

When trying to access many popular websites with Firefox on my Fedora 43 installation, I am greeted with a security warning page with the SEC_ERROR_UNKNOWN_ISSUER error. For most of these websites I can simply accept and continue, but HSTS-only sites will not permit this.

Affected websites include but are not limited to (based on exceptions in the certificates section of Firefox settings):

• github.io (many subdomains)
• purdue.edu (many subdomains)
• iu.edu
• ebay.com
• cbsnews.com
• iwm.org.uk
• home.cern
• celestrak.org

Any help in resolving this is appreciated.

I established a new email address in my existing Thunderbird platform. It only configures an "Inbox" folder and a "Trash" folder. I can not add a "Sent" folder (or "Draft" or "Archives", etc.). I tried deleting the account and re-establishing it, but that did not work. I did notice that emails sent from the new account are being saved in my "Local" account folder's "Sent" folder.

I have also gone into "Account Settings" for the new email account to make sure the software was properly configured with where to store sent messages and drafts, but the setting reverst back to the "Local Folders," presumably because there is no "Sent" folder in the proper account.

Please Help!!!

How do I change the email account inserted by Firefox when I click on an email link?

I have previously changed the main email address (added secondary address, swapped secondary for primary, deleted secondary) but when I click an email link in a web page to write an email to the web page business, the old deleted email account is used instead of the new one. This old address is not listed at all as far as I have seen in my Mozilla Account.

hi. how can i copy or cut the URL from the address bar?? There is no pop-up, drop down ? All other browsers can do this.

and also the whole text in the bar seems not to be selected.

Yesterday I upgraded my PC from Windows 10 to 11. Today I discovered my Local Folders are not visible. Searching tells me the messages still exist, but TB does not show the folders. I did the same upgrade a month ago on a laptop (Windows 10 Pro to 11), no problems. I didn't externally back up the messages as I am a dinosaur and don't know how, but at least they are still on the hard drive. Thousands of them though so I need the local folders back. Tried all the fixes I can find on the Community Forum, without success. Can anyone help please? Bob

anyone know how to recover my email contacts in latest version ot TB, theyve dissapeared since using spam aniallater , with is now uninstalled.

i have the same email acct on my other pc , could i recover everything from therte as its intact thanks

also my TB spam filters have now dissapeared [but still seem to be working] but filtering the wrong things. thanks if anyone can help

Hi,

the password manager (about:logins) is a very handy feature, i use all the time. However, tehre is so many pages where the FF password manager fails to suggest the correct login user name to fill in the "user" field. (Interestingly, the password fill is much more accurate).

To start with: for logging in on THIS VERY SITE for posting this question, I needed to:

1. manually open the FF logins page
2. enter the url "accounts.firefox.com" for search
3. pick the entry
4. copy the username
5. swithc back window
6. paste and confirm.
7. repeat for password (I think - or came this at least suggest correctly maybe)

What's going wrong? Is my installation broken - or is this for all users the same experience?

Tks

In Thunderbird 143.0.1 (64-bit), my appointment invitations are no longer sent automatically to the respective email recipients, as they used to be. I can't find any settings where I can change this. Under ‘Troubleshooting Information’ in the line ‘Send appointment notifications via email’, the value is not set to ‘true’. I look forward to your help. Best regards, Thorsten

hi in a new win 10 instal most text incl Fire Fox text is made up of letters [font] that are made of thin and thick lines [in the same letter]

i dont know if its a strange font or another problem, i have copied all "font" setting from my other pc where i dont have the problem.

also i cant get spell check to work here dsespite turning it on

its very distracting, would be very gratefull for any suggestones if any one can 

help thanks

Every time I boot Win 10 Pro, a half dozen Firefox pop-ups complain as indicated, as well as the wrong google page login (Voice instead of Calendar). There is no Firefox showing in the Windows>Task ManagerStartup> list. Firefox(143.0.4 (64b))> settings>General> Startup> has only [check for default]. I cannot find the controlling 'Startup' controls.