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Just recently when logged onto Hotcopper.com.au have been getting a message that reads "This page is slowing Firefox down. To speed up this browser, stop this page." There is a STOP button, that helps for a moment or two only. When I open the program with MS Edge, the problem does nor occur. I was going to remove the Firefox App but saw the repair option. Repairing did not stop the problem. Any suggestions? John I have a near new Acer laptop running Win 11.

I have both a Microsoft 365 email account and a outlook.com email accounts. I'm using version 148.0. Both account set up just fine. When I delete an email from either account after a couple of seconds I get a message saying "The current operation on 'Inbox' did not succeed. The mail server for "the account name" responded; [TRYCREATE] The destination mailbox could..." that all I can read. Why?? It is only on the Outlook accounts. I have several other account set up and they all delete the emails.

I got a new computer, and after installing Thunderbird, it took forever to get it set up with the information from my old computer. Now, the unified folders aren't working. All of my mail is going into each account's inbox. There's no option to choose anything on the unified inbox, only the same thing as the other inboxes have. Help, please!

Hi there.

For some reason, 3 of 4 accounts I use no longer open on the accounts list. I cannot expand them, I cannot "Get Messages" for them, there's no reaction whatsoever, as in no message in status bar (which works fine, as confirmed with that 1/4 account that still works).

I checked for subscribed folders and all of them are. I even was able to add a new folder, which does get added via IMAP. This is, therefore, not a connectivity issue.

I also checked the Developer Console and Activity Tasks, absolutely nothing shows there.

I removed global-messages-db.sqlite, folderTree.sjon, the .msf files. I checked in Troubleshoot mode. Nothing helps.

This looks like some nasty bug and I am happy to help debugging this further, if you point me in the right direction.

Hello, I just upgraded from a Samsung s24 to an s26. I downloaded the Firefox app and signed in. I went into settings and tried to type in a custom homepage like I was able to on my s24. I can't find where to be able to type in a homepage to use. For example use www.yahoo.com as my home page. I've tried to Google and watch YouTube videos to find the solution but I can't find it. Any help will be much appreciated. Thank you

Since the update on 2/16/26. I have not been able to access several websites that I was able to before the update. Hoe do I uninstall this update and all others after this date

I apologize for the unhelpful summary line, but I am totally new to Thunderbird and the Unified Inbox is acting so strangely that I don't have any simple way to describe it.

Many (but not all) of the emails are displayed twice in the list of messages.

When I delete a message that isn't doubled, the message disappears from the inbox (as it should).

But when I delete one of the doubled messages ONE disappears as it should and on the other Thunderbird clears the From and Subject fields and changes the date to 12/31/1969, 19:00 -- the changed entry stays in the list and the body of the email is still shown in the lower pane. The only way I can get rid of the message is by selecting another folder (ANY other folder) then when I return to the Unified Inbox the deleted messages will be gone from the list.

I can't believe that this is how Thunderbird is supposed to work, so I assume I have something configured incorrectly (although nearly everything is still at the defaults that the installation gave me).

just installed thunderbird on my new windows 11 laptop (samsung galaxy book 5) and tried to add my comcast email account. i entered the address and password and it took me to an xfinity web page to validate my password for imap.comcast.net. since i'm not on my home network it send a code to my mobile phone which i entered successfully. it then asked my for the address on my account. i entered it and it told me it didn't recognize the address! I called comcast and finally got to speak with a human (no mI'veean feat). We verified that my xfinity account allows third party applications to access my email. That's pretty much all the help she could give me. i've run thunderbird on my home windows 10 desktop with no issues accessing my comcast email. Has anyone encountered this problem? does it have to do with windows 11 settings? any help would be appreciated.

Hello everyone,

I’m wondering what exactly "remote improvements" actually are.

Mozilla says: "Remote improvements range from fixes to feature changes to Firefox. They are delivered remotely between versions and updates to make your browsing experience stabler and richer (...)."

They are not studies or A/B tests, as those are enabled/disabled separately. They also do not concern WebCompat shims, Safe Browsing, or similar features, nor larger security fixes or more significant bugs that are resolved with a out-of-band update – correct? Is it similar to Windows CU Previews - meaning improvements, fixes, and feature changes that would be included in the next upcoming regular update anyway? Not a case of "let’s roll something out and see how users react" thing?

Have I understood that correctly?

Thanks and best regards, Martin

just installed thunderbird on my new windows11 laptop and tried to add my comcast email account. i entered the email address and password and it sent me to a comcast web page to validate my email on imap.comcast.com. i am not on my home network so they sent a code to my phone which i entered successfully. it then asked for the address on my (comcast) account. i entered it and it told me it didn't recognize the address. I called comcast and finally got a human to talk with. we verified that my comcast account was set to allow third party access to my email. that's all the help she could give. i've run thunderbird on my windows 10 desktop with my comcast email for years with no problem. Has anyone encountered this problem?

When I go to see a firefox bug such as the following, https://www.mozilla.org/en-US/security/advisories/mfsa2026-10/

There appears to be more details in https://bugzilla.mozilla.org/show_bug.cgi?id=2014390 located at the bottom. When I try to view the details it asks me to log in. I do not see any reason I should have to log in to view the issue as I only intend to view the bug. Why does it require a login ?

Using firefox 148, when I select the "CIRA Canadian shield" DNS over HTTPS option it does not work. If I select the other 2 options Cloudflare or NextDNS those options work.

What is the problem with DOH for CIRA option ?

I would like to make a new account with an email account I control. Currently, the secondary email address can receive 2FA codes and such, but is there some way to transfer all of the history I have with the account to a new one? I cannot make the secondary email address the new one because my university email is now unable to receive emails such as 2FA codes.

The Firefox advertising page

I clicked on the Wellnee link and their site is rigged to extort money! I chose the product (advertised as a discount), entered my bank details then instead of buying the product, I'm sent to a page where aside from just leaving the page, I find that i have to order 3 more of the same product, if I want to get the discount, so I exited the page, only to find that not only had I been charged for the original (without the discount!) but an additional charge had been taken!!!

Then I get a text message saying they couldn't connect to my email, so everything is done through texts (they had my email). When I went to their site they use a fake US phone number; there's no email, only a form (does it work?)

https://shop.trywellnee.com/

The fake US +1(844)961-3766

And why can't I contact Mozilla directly rather than this forum?

I have a valid correspondent email address, that no matter what I do it keeps sending his email to spam.This started about two months ago, up till then there was no problem. (A) where do you hide the list of email addresses that are being considered as spam? (B) if his email address is not there, what else can I do to fix this annoyance. Asking him to change his email address is not an option.

I have 18 shortcuts that I have added to the Firefox desktop, but every time I open a new link, a shortcut is added to the desktop. How do I keep these unwanted shortcuts from being added to my Firefox desktop?

I have left Shortcuts toggled on, since I want to see the 18 shortcuts that I have manually pinned. Fine so far.

I have unchecked Sponsored Shortcuts, but I still am seeing sponsored shortcuts. What am I doing wrong?

All my Tabs Group have disappeared from the Tab Bar. I can see the Closed Tab Groups in the drop down but i can't find a way to re-open Closed Tab Groups. Any clues welcome. Running 146.0 and on the beta update channel.

I closed 1 tab on my phone through the desktop synced tabs. Since then, Firefox has been continously sending me notifications about the tab being closed. I've clicked on the notification to open the app, but I still keep getting this.