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I'm trying to trim down my hard drive, and I see that my Profiles folder has 2 ImapMail subfolders. In the first of them, imap-gmail, I have 14 All Mail files numbered "-1" to "-13" plus the most recent All Mail (today's date), unnumbered. Most of these All Mail files are quite large. Can I delete all of them except the most recent, unnumbered one? In the second subfolder, imap-gmail1, the files are all from before 2025, and instead of multiple "All Mail" files I have multiple "rstmp" files. What's the deal? Can I delete this whole folder? Is it a backup? Thanks for your help. FYI, I'm up to date in Windows 11 and Thunderbird, with a fairly new computer. I hope I've provided enough into. Looking forward to your help. all the best, Steve

The SSL cert has been installed by the entity (Gridhost) from whom I have bought it for 20 years. And as explained, Firefox still shows it as Not Secure while Chrome say it is secure.

I have three separate Yahoo email accounts. I set up Thunderbird to link to each Yahoo email account separately. It worked fine for a year or more. On 5/25/26 one of the three Thunderbird email accounts stopped downloading emails from Yahoo. I could see at the bottom bar Thunderbird indicating that is was downloading 1 of XX emails, but never actually downloads them. There is no error message. I checked the Yahoo email account to verify the number of emails I am missing from Thunderbird and the number is correct. I can see the emails in Yahoo. I'm the only person using Thunderbird, so no changes have been made to previous settings for retrieval. I confirmed Security and server settings for Thunderbird in and out going emails, and Yahoo are correct. I tested the connection in Thunderbird, and the connection is successful. I tried to send an email from the Thunderbird account having issues, and the email was sent and received by the recipient. The recipient replied, and Yahoo received the email, but failed to download it to Thunderbird...along with all the other emails since 5/25/26. I unlinked the account and reestablished the link between Yahoo and Thunderbird, and still not fixed. I tried restarting the computer, with no change. I tried to send an email from Thunderbird to one of the other Thunderbird emails and it was sent and received. I made changes to Thunderbird to force the download of emails, and it still wouldn't do it. I turned off my antivirus, closed Thunderbird, and restarted it, and that didn't change anything. The capacity of emails on the email in question only has 739 emails, so it's not over the limit and I have plenty of storage capacity. Thunderbird is set to save emails, Cookies and cache were cleared, no change. I ran the folder repair feature in Thunderbird, but there was no change. I compared all the settings between the other Thunderbird emails that are working against the one that isn't, and they are all the same. There was a suggestion to close out of Thunderbird and delete the "Global-message-db.sqite" file from the Thunderbird profile in case it was corrupted, and it would recreate this file when Thunderbird was restarted. The file was recreated, but it didn't fix the problem. There was mention that a suspicious email in Yahoo might be blocked by Thunderbird, so I placed various emails in the spam folder, and it didn't work. I did find one email in the Yahoo spam folder that was dated before 5/25/26 and moved it to the Yahoo inbox. Lo and behold, that one email downloaded to Thunderbird. So there is something within Thunderbird preventing emails from downloading after 5/25/26. I've read many people complain about similar download failures with no solid fix. Someone mentioned it fixed itself on a day, but then stopped again days later. Someone else mentioned Yahoo changed its password protocol to transfer emails, but that doesn't make sense since the other two are still downloading based on the "old" password protocol. I'm at wits' end. Thanks for reading all of this. I hope someone has a solution.

Hello,

as you can see in the image I can't select German as spellcheck language even though I have installed the German dictionary. My Win OS and the browser use English but I want German as spellcheck as well.

What I am missing?

Thanks

I have always been able to click on a box in the upper right to see my bookmarks on the left side of the screen.

This has now disappeared and the only way I can see the bookmarks is to go to "manage bookmarks". I don't see how to bring it back to the way it was.

I didn't knowingly change anything.

Thank you

As title says, on my main profile, i dont see any option to use the new tab widgets function. If i make a new profile, it is there on default.

How to add it on my main profile?

I am reporting a technical issue regarding the built-in Firefox VPN feature. It was fully functional in my location (Czechia) until June 15, 2026, but it suddenly disappeared from my toolbar and customization menu on June 16, 2026.

Despite following the troubleshooting steps provided in the official help article "Unable to find the built-in VPN in Firefox," the feature remains unavailable.

Here is a summary of the diagnostic steps I have already performed:

- Data Collection settings: Confirmed that "Allow Firefox to improve features, performance, and stability between updates" is enabled.

- About:studies: I have checked my active studies as shown in image_464983.png. There is no "VPN - MVP Beta Holdback" study listed that would explain the removal of the feature.

- About:policies: The Enterprise policy service is inactive, and there are no restrictions blocking IPProtectionAvailable.

- Account management: I have signed out of my Mozilla account and signed back in, but the VPN icon did not reappear.

- Installation: I have performed a clean reinstallation of Firefox, which did not resolve the issue.

I have also checked the toolbar customization menu and the overflow menu, but the VPN icon is not available.

Since this feature was working perfectly until yesterday, could you please investigate if my account profile has been excluded from the current rollout or if there is a regional issue affecting users in the Czech Republic?

I have attached my about:studies screenshot (Screenshot_about_studies.png) for your reference.

When I add a calendar event, it defaults to Holidays in US. How do I change this to the calendar associated with my email address? I often forget to change the desired calendar. Also, How do I edit the Holidays calendar? Thanks BigSam

Hi, bit of a strange ome. I have 4 email account in Thunderbird. One is my AOL account and one is my wifes AOL account. This morning my emails suddenly started appearing in both my AOL account and my wifes AOL account while her emails don't appar at all. I've deleteing her account and setting it up again but the same thing happpens. I'm at a loss. Can you help?

I Googled Thunderbird and received this link: https://www.thunderbird.net/en-GB/thank-you/?form=support&utm_content=post_download&utm_source=thunderbird.net&utm_medium=fru&utm_campaign=donation_2023&downloaded=True&download_channel=esr It asks for a donation of varying amounts. I donated £15. I received an email thanking me for the donation Thunderbird <give@thunderbird.net> Whenever I click download I'm returned to the Donate page. Are these URL scams?

Hello,

Since this morning, I haven't been able to access Bsky on my laptop because of a supposed HSTS risk, which means I can't add an exception to visit it. I use Firefox on my Android and going to the mobile version of the website lets me in no problem, so I assume there's an issue with my laptop.

I'd usually wait a few days and let it solve itself but just in case it's something on my end, I'd like to solve it! I'm on 151.0.4 (64-bit), don't use a VPN or an anti-virus, I have a couple of privacy add-ons but they've been here forever and they've never caused a fuss. I can post a screenshot of the error code and the certificate it sends me if it's any help.

I'd appreciate any pointers! Thanks!

Good day! Just this afternoon, I started experiencing some strange behavior in my browser. Google asks me to solve a captcha every 15 minutes, and when I access services like YouTube Music or even Google Calendar, it asks me to enter my browser master password (I have it enabled), even though my Google account password isn't there.

I've updated my IP address three times, and everything works fine on another PC on the same network, as well as on my phone with the same browser.

The window doesn't always appear, but usually two or three times at a time.

I've also noticed a pattern: for example, on YouTube Music, video previews don't load until the window is closed.

I don't know what the issue might be, but updating to the latest version didn't help. This problem practically prevents me from using the browser. What should I do?

I'm asking this question so I can post some helpful information for people wanting to create a backup of their profile.

If you are using Windows OS and you got your download from the official website: https://www.thunderbird.net/en-US/thunderbird/all/

How do you locate the correct folder to backup? The backup must contain everything, profiles, mail accounts, emails, address books, calendar, preferences - the lot. The backup can be used to transfer between computers.

Hello, I noticed that when browsing webpages in Firefox, a window periodically appears asking me to confirm a certificate, presumably from a website (roughly called lt3.google). I haven't downloaded anything malicious and I regularly scan my system with an antivirus. Please help and respond. Thanks in advance.

Hi, Since approx. 1 month, I cannot receive nor send emails from my Windows 11 desktop computer. My ISP is Videotron and they tell me that from their end, everything is fine and the configuration is fine. If I use the Videotron Web Service, I can send and receive emails using the Videotron Web Services but these are not reflected on my Thunderbird email interface. If I try to send an email from Thinderbird, I get this message # # * * Sending of the message failed.

1. # * * An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: smtp.videotron.ca Videotron ZGdcwFfPIz2we service temporarily unavailable AUP#EML-016.'

On my Android smartphone, Thunderbird is installed and it works perfectly...I can send and receive emails.

What can be done to make sure that I can send and receive emails from my computer, and to keep the smartphone and computer synchronized. Thank you

The new Firefox built-in VPN, rolled out to Australia this week, is not redirecting to the chosen country location.

Despite selecting either US or UK in the country list, websites are still identifying me as located in Australia.

For example, despite VPN being on and US selected, cunard.com still redirects me to my home location of Australia (see https://www.cunard.com/en-au in address bar). Screenshot attached. Other websites similar.

Hello, I am experiencing an issue where the built-in Firefox VPN feature has completely disappeared from my browser interface. I cannot see the icon on the toolbar, and the feature is not active. Could you please clarify if this feature has been geo-restricted or temporarily disabled for certain regions, or if there is another hidden preference I need to modify to restore it? Thank you for your assistance.