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I recently obtained a digital certificate for use with S/MIME. I followed the process laid out in

https://support.mozilla.org/en-US/kb/instructions-smime-certificate-using-csr

to generate my key pair, create a CSR, submit it to a CA, download the resulting certificate file, and import it into Thunderbird. I also imported the intermediate certificate showed as the issuer for my cert, which in turn appears to be signed by one of the certs trusted by default in Thunderbird.

Having done that, I see the certificate showing up under "your certificates" in the Certificate Manager, with a "not before" date in the past and a "not after" date in the future. So everything appears to look correct, but when I try to send a signed email I get the following error message as a pop-up:

"Sending of the message failed. You specified that this message should be digitally signed, but the application either failed to find the signing certificate specified in your Mail & Newsgroup Account Settings, or the certificate has expired."

And if I look at the console in developer tools I see:

"mailnews.send: NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIMsgComposeSecure.beginCryptoEncapsulation]

   _startCryptoEncapsulation resource:///modules/MimeMessage.sys.mjs:488
   _writePart resource:///modules/MimeMessage.sys.mjs:536
   createMessageFile resource:///modules/MimeMessage.sys.mjs:82
   createAndSendMessage resource:///modules/MessageSend.sys.mjs:147
   CompleteGenericSendMessage chrome://messenger/content/messengercompose/MsgComposeCommands.js:6456
   GenericSendMessage chrome://messenger/content/messengercompose/MsgComposeCommands.js:6372
   SendMessage chrome://messenger/content/messengercompose/MsgComposeCommands.js:6984
   doCommand chrome://messenger/content/messengercompose/MsgComposeCommands.js:1085
   doCommand chrome://messenger/content/messengercompose/MsgComposeCommands.js:1263
   goDoCommand chrome://messenger/content/globalOverlay.js:99
   oncommand chrome://messenger/content/messengercompose/messengercompose.xhtml:1
   openWindowPrompt resource:///actors/PromptParent.sys.mjs:75
   receiveMessage resource:///actors/PromptParent.sys.mjs:18
   openPrompt resource://gre/modules/Prompter.sys.mjs:1228
   openPromptSync resource://gre/modules/Prompter.sys.mjs:1071
   alert resource://gre/modules/Prompter.sys.mjs:1375
   alert resource://gre/modules/Prompter.sys.mjs:78
   fail resource:///modules/MessageSend.sys.mjs:358
   createAndSendMessage resource:///modules/MessageSend.sys.mjs:157

MessageSend.sys.mjs:149:32

   createAndSendMessage resource:///modules/MessageSend.sys.mjs:149
   CompleteGenericSendMessage chrome://messenger/content/messengercompose/MsgComposeCommands.js:6456
   GenericSendMessage chrome://messenger/content/messengercompose/MsgComposeCommands.js:6372
   SendMessage chrome://messenger/content/messengercompose/MsgComposeCommands.js:6984
   doCommand chrome://messenger/content/messengercompose/MsgComposeCommands.js:1085
   doCommand chrome://messenger/content/messengercompose/MsgComposeCommands.js:1263
   goDoCommand chrome://messenger/content/globalOverlay.js:99
   oncommand chrome://messenger/content/messengercompose/messengercompose.xhtml:1
   openWindowPrompt resource:///actors/PromptParent.sys.mjs:75
   receiveMessage resource:///actors/PromptParent.sys.mjs:18
   openPrompt resource://gre/modules/Prompter.sys.mjs:1228
   openPromptSync resource://gre/modules/Prompter.sys.mjs:1071
   alert resource://gre/modules/Prompter.sys.mjs:1375
   alert resource://gre/modules/Prompter.sys.mjs:78
   fail resource:///modules/MessageSend.sys.mjs:358
   createAndSendMessage resource:///modules/MessageSend.sys.mjs:157"

I can't make sense of the error message, since the certificate appears under "your certificates" in the certificate manager, and it does not appear to be expired. Can anyone suggest how to determine the root cause and fix it? Does it matter that the certificate is for a non-default identify I've added for the account in Thunderbird? Does it matter if the "common name" in the certificate doesn't match the "Your Name" field in Thunderbird? Any pointers on what to check would be appreciated.

I use vertical view. Hate threading so that's turned off. I use a medium to large message pane. Recently been having issues with column visibility. Not sure if this is new or whether it's that I've come to a Linux client from a Windows one and there's a setting I missed when I set up the client.

Essentially dragging the column divider doesn't work properly (for me). The columns always seem to auto adjust width. Similarly if I resize the message pane the columns don't remain fixed they auto adjust.

I don't find this helpful. I prefer to set up the columns to display the amount I want/need in subject and From and I truncate the date to simply not display time.

How do I set column widths to remain where I put them? Or is this function now lost.

I am using Linux mint and have never encountered this problem before. It is not a login or password problem! I can't even open the site to get to that part! Connection timed out. Is there a simple fix like allowing AI enhancements? I found disabling them solved my shut down lag time and load time. I wonder what other sites won't work now.

bold text So I get the latest update to Firefox this morning, open a new tab, and all the tiles I had arraigned the way I wanted them no longer in that order, some are missing, some are duplicated 2-3 times. Why can't you guys quit with the window dressing BS and just make the browser stable. Why do we need to hunt for functions that were the same for many years that you decided needed to be changed? I remember when 'Settings' was on the new tab window instead of on the drop down menu in the tool bar.

My new tab tiles are a mess and I don't think I'll ever forgive you for that!

thunderbird refuses to connect with my email account. it says, either the name is wrong or the passwort, or the settings. name and pssword is proofed, so its the settings. where can i find them, and what is to do ?

I use Thunderbird on dark mode, so by default, unformatted text (where I haven't explicitly set text color) appears as white text on a black background in my compose window. The same unformatted text, when sent to someone viewing it in light mode, appears as black on white to them and remains readable. When I use white text in my compose window, it looks identical to me, but remains white when sent and is thus unreadable white-on-white to those using light mode. Is there something in the composition window that indicates whether I'm typing with formatted or unformatted text? (No, the color selector tool does not do this. When typing unformatted text, it displays the last selected colors, regardless of whether they are being used.)

If there's no way to distinguish this, could someone please add a UI element for it?

Is anyone looking into this? I found an article that told me to remove some cash files and it seemed to fix the issue but it continues to reoccur. Some apps such as MS360 Outlook seem to trigger it, but if it was truly just a corrupt cache issue then cleaning the cash/profile once should have fixed the issue. Instead its become a constant pain in the *** and I'm tempted to find another browser. Seems very recent as well as I've never had issues with firefox before.

Ubuntu 24 Mozilla Firefox 151.0.3

Every time I open Firefox, the checkbox next to "Opening links in tabs" always disappears, even though I've checked it in previous sessions. How can I make it permanent?

I use Firefox on the Linux Mint operating system.

My Yahoo account on Thunderbird sees no email found.

My eMail Providers: Yahoo, AOL, Gmail.

AOL and Gmail(2 accounts) work fine. Only Yahoo doesn't respond. As you can see in the attached screen shot, it shows a "No Messages Found" message.

I have tried everything listed in the support page.

I'm sure it is something simple but I can't see it.

Firefox 151.0.1 64 bit for Arch Linux I am trying to create a desktop app from a website - the ai is saying if there is no + sign in the url box then try More Tools -> Create Shortcut but there is no Create shortcut there. So how to create a desktop app from a website?

I am using Kubuntu 26.04 and I am using the monthly stable channel version of the Thunderbird Snap. In KDE system settings, the default email client is set to Thunderbird. Upon every startup of Thunderbird, it ask if I want to set it as the default client for email, newsgroups, feeds and calendar and when I click yes and close Thunderbird and reopen it it does the same thing, over and over. Otherwise the email program operates just fine otherwise. My email accounts are all setup properly and functioning and working and it downloads email just fine. It just has that annoying popup upon every startup. I've included two images to show what I mean. I like the Snap version and prefer that container format. I would like someone who is smarter than me to file a bug on my behalf.