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Please help me.

I made no changes to Firefox. It just stopped working. If I click on the icon I get a momentary hour glass, the hour glass goes away, and Firefox never comes up.

If I try to open it as administrator, it comes up but will not accept any web addresses. I can type in a web address but is doesn't go to the site. The screen just stares at me and does nothing.

Both Edge and Chrome work just fine. I have used Firefox for many years. I love it but has just stopped working. I have reinstalled it several times and the same problem occurs.

Mike Manley [edited phone# and email from public support forum]

Dear Sir or Madam,

I have just migrated Thunderbird to my new CUBI desktop running Windows 11. I get security errors when I launch Thunderbird. My email provider The Messaging Company advised me to change server settings, which are now shown in the Troubleshooting Information page as account1 (pop3) pop.themessagingco.com.au:995 SSL/TLS Normal password smtp.themessagingco.com.au:587 STARTTLS Normal password true.

On launching Thunderbird I get the message Secure connection failed live.mozillamessaging.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate has expired. Error code: <a id="errorCode" title="SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE">SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE</a>

   This could be a problem with the server's configuration, or it could be someone trying to impersonate the server.
   If you have connected to this server successfully in the past, the error may be temporary, and you can try again later.

Or you can add an exception…

AND when I attempt to send an email I get warning that the SMTP server does not have a valid certificate. If I ask, in either case, to "Get Certificate" the response is that the site attempts to identify itself with invalid information.

I have "tried again later" over two weeks, and nothing has changed.

The Messaging Company is a fairly large email provider: it seems strange that its security is incomplete. However, I am not happy to just set an exception and over-ride these errors without doing all I can to check that there is not something screwy going on. I really value using Thunderbird, and The Messaging Company's advice that I should just use webmail is not at all satisfactory: I keep everything on my computer or backed up to a portable drive here.

Please: is there anything I can do or should know to fix this problem?

Best Regards, Margaret Mackisack

Hi, i have formatted my macbook pro, before i have made a back up with timemachine. I'd like to restore my bookmarks but i can't find it on the back up. I have tried to find on Library>Application support but in this folder there is not the Firefox folder in wich i expected to find the Profile folder.

Updated from Windows 7 computer to a new HP running Windows 11, downloaded Mozilla thunderbird from my old computer I had used it successfully for years, & received all my In-box email but nothing was received in my Sent box. The Thunderbird application works as I sent myself an email and received same, but the entirety of my sent email history never arrived. What to do?

I installed Firefox on a Macbook Pro with Apple Silicon, M3. The installation was from the Firefox site, I downloaded the dmg and then dragged into Applications.

I find that playback of media stutters, and is choppy--not sure of a better way to explain it. E.g., YouTube videos and the Bandcamp player have "stuttered sound". Opening another site in another tab can make this effect worse. Likewise, trying to run Google Meet in a browser window causes basically everything on the computer to become very slow.

This still happens even if I go to "about:profiles" and then "restart with add-ons disabled".

But if I switch to another browser, Safari or Chrome, then I don't have the issue. e.g. I can play YouTube in the background fine even when running some compute intensive task.

I have also tried turning on/off "performance settings" and the "use hardware acceleration" checkbox underneath it -- neither of those seem to have any effect.

Activity Monitor showed that at most Firefox was using ~4 GB of memory of a total 48 GB, and the memory pressure indicator seems to be quite low.

I have run Firefox on other systems (e.g. System76, older Macbook Pro) with multiple windows open each having 20-30 tabs and never had an issue like this.

It really seems like it has something to do with how Firefox is interacting with the M3? Happy to learn I'm wrong. And happy to provide more details about the hardware or my settings if it would help.

I was trying to download ledger live from an official site when I noticed Firefox had twice tried and failed to download an old version of the tor browser I downloaded a long time ago.

A few hours before this happened my pc froze for a minute.

I'm not sure if I have malware on my device or if this is Firefox acting up. My antivirus scan shows nothing.

I recently patched to Thunderbird 115.12.2, and discovered that threading has been turned on everywhere. Reading through the forum, I disabled threading by default in the config editor via mailnews.default_view_flags, and manually went through every folder setting "View" -> "Threads" -> "Ignore threads".

However, it appears that disabling threading is only honored for the inbox. Setting "ignore threading" on any other folder is ignored, and Thunderbird continues to thread.

For example here is the "Sent Mail" folder with "ignore threads" set (see screenshot) and it still displays with threading. Apparently, "ignore threading" only works with the inbox. I would like threading disabled on all folders, not just the inbox. If there was a switch to disable threading universally, that would be easiest for everyone who dislikes threading.

Thanks in advance. John N. jnyhuis@gmail.com

It used to be that Firefox had different containers. I kept separate ones for shopping, banking, Facebook, etc. Now I had to erase my MacBook Pro IOS, and after a few days of trying to use Safari, I installed Firefox. But I can no longer see the possibility of using containers. I found them particuarly helpful when I had more than one account for a certain platform - with containers, I didn't need to sign out and sign in to switch users. It also (supposedly) kept Facebook from tracking our interests. Has Firefox done away with containers? Or have I simply forgotten what they are called (buckets, maybe?). I searched and searched the help articles to no avail. If they have done away with them, why?

By the way, Chrome (which I had to use at work) started offering a similar product and it was also very helpful.

I'm using Thunderbird 115.10.1 and Windows 11 Pro. Thunderbird has suddenly started sending my partner's emails to Trash. We've been emailing fine for years before this. She has not changed anything in her emailing. I've closed and re-opened Thunderbird. Her emails are not marked as Spam and I have marked some of them as 'not junk'. Anyone got any ideas? I can't seem to find reference to other people having this problem.

I don't know what happened, I haven't been tinkering with anything. This happens for every video, not just this one. I've also posted my addons as well, in case that helps with anything.

Greetings,

In Thunderbird 115.12.2 (64-bit) on Linux Debian 12.6, when I examine "Help -> About", cursor movement in the focused information window moves the list of messages displayed underneath in the unfocused messages window. Hopefully the image suggests the issue. Is this an OS problem or something that can be corrected in Thunderbird?

Also, I maintain several accounts, each with several folders. It would be helpful if these all stayed collapsed until selected, with a digit alongside indicating the number of unread messages in each, but recently they each seem to fully expand at inopportune times, making email management rather difficult.

Is this the result of a selectable setting somewhere, please?

When I start a email message search, I am bombarded with bad suggestions for email addresses. These include addresses from everyone I've received email from even though I have deleted these entries in collected email addresses and my personal address book.

The addresses could be from old purchases or ebay responses or anyone I've ever received an email from. I have deleted most of the emails entirely, yet I still get all these bad addresses when I search.

Is there a way to clear the history in search or remove the email addresses where I have deleted the email?

I've attached a Home Depot search as an example.

Since December last about every 30 days or so Outlook locks my account. This only happens when I "hit" send on an outgoing message from Thunderbird. A friend has suggested that Outlook sees my outgoing e-mails as spam and when it reaches a critical number Outlook locks my account. Attached is a screenshot of the error message. Has anyone else run into this problem and, if so, is there a solution? Thanks, Ken.

How do i access Google OneDrive via Firefox so as to delete my sensitive personal info such as financial PDFs and personal pics, which involuntarily got copied to Google OneDrive thru an erroneous mouseClick?

See, when i keyword search online, it states that Google Drive can be accessed via one's browser for purposes of accessing/deleting one's files. (Frankly, i don't even know if OneDrive is GoogleDrive? Is it?

It's upsetting to me that Google has loads of my personal info, because over the years everyone has been saying "Use Gmail", and so i made that my main email due to convenience. But Google now has, for example, some of my personal home photo's and private financial PDFs, all because I absentmindedly clicked my mouse on a risky part of my email attachments, not realizing that would transfer the JPG (or PDF) to Google OneDrive.

I believe this started happening ever since they imposed the New Gmail without giving us a choice. Prior to that, when i used HTMLgmail, i don't recall this happening when i clicked attachments. With Simple HTML, if i clicked an attachment, i saw a photo. It didn't INVOLUNTARILY auto-transfer my pics/pdfs to Google OneDrive, which precisely reminds me of automatic faucets and towel-dispensers and light-shutters in public buildings, all of which are human-unfriendly.

I can't remove the fake "your computer is locked up" message, despite following advice on your and other sites. I even trashed Firefox, downloaded a new one, but on opening it, scam message reappears. I haven't found any solutions in the on-line forums I looked at.

Hi, I’m trying to move from Outlook 2003 to Thunderbird 115.12.2 (64-bit). Using the import wizard fails. Tools > Import select Import From Outlook and the following message appears. “Either there is no default mail client or the current mail client can not fulfil the message request”. I’m taken back to the Import from screen with the addition of a red panel with “No Profile Found” on it. Outlook 2003 is the default e-mail client, checked more than once. I’m trying to migrate to thunderbird so I have no account setting, thinking they would be imported. My pst’s files have been moved to a directory on a different partition to the Outlook programme, tried creating a dummy profile using default Outlook storage and still fails. I’ve looked at converting pst files to mbox, but this doesn’t see to include the account settings. But I could add them manually or I can not import the mbox files or directory structure into Thunderbird. I’ve been messing around trying other things but nothing works. Internet searches, Thunderbird forum searches suggests solutions but all fails and the steps don’t match Thunderbird menu, etc in many cases. I’m stuck. Can anyone give any advice on how to migrate from Outlook 2003 to Thunderbird. Tools, Add-Ins or manual methods, anything just to get me up and running. PS I’ve two pst files, one is the default main Outlook.pst and the second a secondary store I created in the folders of Outlokk called Store.pst, beside the none default storage location everything else is standard for Outlook and Thunderbird.

Problem: Persistent 150 KB of Cached Web Content For several years, I have gone to “Settings” / “Privacy & Security” / “Cookies and Site Data,” clicked the Clear Data…” button, checked both “Cookies and Site Data,” and “Cached Web Content,” and clicked “Clear”, and consistently gotten BOTH “Cookies and Site Data,” and “Cached Web Content” down to “0” zero. Recently, I have been unable to “Cached Web Content” to go below “150 KB of disk space.”

         I have NOTHING listed in “Manage Cookies and Site Data” or “Exceptions -- Cookies and Site Data.”
         I have tried reinstalling, but the problem has persisted.
         On the assumption that this is malware problem, I have continued to use Mozzella VPN, but stopped using the program for browsing, etc.  Should I stop using it altogether until the problem is fixed?
         Can you tell me how to get rid of the last “150 KB” of “Cached Web Content”?

Mission Federal Credit Union account page loads but does not allow account info to load. Mission Federal tech say it is a problem with Firefox. Please fix. same problem through two updates of your software.

My (custom) cursor has recently started being transparent when I hover over a YouTube video. On darker colors it's fine, but on white it's straight up invisible. I tried recording it, but the recording doesn't capture the transparency. This didn't happen before, I changed nothing.