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I have been dealing with this issue for the last several thunderbird versions. I am currently running 115.18.0

Everytime I try to configure an existing gmail account for thunderbird via File -> New -> Existing email account

I specify my Name and gmail email address, then password for the gmail account.

The google authentication pop up launches " Mozilla Thunderbird wants to access you Gmail" and I click "Allow"

As soon as I click "Allow" I am asked to download a file.

Google gemini says this file is a sign that Oauth is not being accepted by thunderbird.

What I have tried. I verified Thunderbird is set to accept cookies I have verified there are no previously stored gmail passwords (as this has never worked) I have changed my default browser from Firefox to Brave and verified the same behavior

please help, Thunderbird has never been able to connect to gmail when running on this Ubtuntu install.

Since update yesterday, new tab is empty. Whatever I do, open new tab, open new window, go to `about:newtab` manually, it does not load anything. The view is totally blank. I can navigate to other pages fine as it should though. Only New Tab view is broken. Diagnostic mode does not work. I don't have plugins that would affect New Tab anyways.

I have been using Mozilla Thunderbird for decades and they have even contributed a small amount of money to Thunderbird periodically. Just within the last two or three days all of a sudden I have been unable to send emails with my phone. I receive emails, but I do not send them. So I opened up a laptop where I did not have Thunderbird and set it up properly through Spectrum using the incoming and outgoing servers as mail.twc.com. and yes, just like on my phone. I continue to receive new emails, but even with the laptop I was unable to send an email. I received the message"send message error sending a message failed. The message could not be sent because the connection to outgoing server smtp mail.twc.com was lost in the middle of the transaction. Try again."I contacted Spectrum twice and both times they had me try to send a message through their Web server spectrum.net and that message did go through. Of course then their response is that this has to be a problem with the third-party app meaning Mozilla Thunderbird, and they can’t help with that at all. I sure would appreciate some help because I hate to walk away from Thunderbird as well as change my email address after all of these decades.

I am so annoyed, MS clearly sabotage this to push people back to their horrific software! I am so against that idea I lost an entire full work day today trying to do something SO simple, to install Thunderbird (for a friend) and connect it to MS365 email address.

It's IMAP, it should have taken SECONDS! It did create it, pulled in tons of email, but refuses to SEND any! I tried every single suggestion I could find online, going back years. NOTHING works! All i get every time whne sending email is : "Login to server smtp.office365.com failed. "

Does anyone have a magic cure, 6 solid hours of this and I still refuse to give up hopes of making Thunderbird the active mail client! Thanks

Hello,

I hope someone can help me with this little issue.

I’ve downloaded firefox to my ipad and every link I click, it opens in a new tab, instead of staying in the same window. I find it quite confusing. Especially when I had a couple of tabs open already. So everytime I clicked a new link,I didn’t immediately see that I opened another tab, and kept clicking the link (thinking it didn’t work), until I had multiple tabs opened, but they weren’t visible in the tab bar. It’s not very user friendly to me.

Is it possible to prevent a link from opening in a new tab? I’ve looked into the settings, but for the life of me, I’ve not been able to find a solution.

Can someone guide me here?

Thanks in advance,

Best, I

When I reconcile my checking account each month, it's handy to be able to search my e-mail for the amounts of transactions that I can't identify by name alone. Gmail allowed me to do this. Thunderbird, for some reason, doesn't. Anytime I search for a numerical value (e.g., "36" or "9.58"), Thunderbird returns no results. Why are numeric strings not searchable? Is anyone working on this deficiency?

I have been using Google Messages in Firefox for over a year, and have never had any problem until the most recent Firefox update from Linux Mint. Google Messages loads on the tab, and everything seems fine. But when I click on a conversation on the left, it crashes as it's loading the conversation.

All of my software is up to date, i.e., no new software updates are indicated in the system tray (?) on the panel. Firefox info: mint-001 - 1.0 147.0.2 (64-bit)

System info: Linux Technodrome 6.8.0-100-generic #100-Ubuntu SMP PREEMPT_DYNAMIC Tue Jan 13 16:40:06 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux

 Host: Technodrome Kernel: 6.8.0-100-generic arch: x86_64 bits: 64
   compiler: gcc v: 13.3.0 clocksource: tsc
 Desktop: MATE v: 1.26.2 wm: marco v: 1.26.2 with: mate-panel
   tools: mate-screensaver vt: 7 dm: LightDM v: 1.30.0
   Distro: Linux Mint 22 Wilma base: Ubuntu 24.04 noble

Hopefully this gets fixed soon, because checking my messages using my PC saves so much time.

Thank you

I am signed in on all my devices. Yet nothing has synced since October 2025. So none of the books marks from my laptop display on my desktop in bookmark folder. The folders don't even match what is on my laptop. How do I fix and how do I prevent in the future?

I have Norton 360. I just reinstalled a brother printer and now I get the "Your browser is being managed by your organization". While I sync with my laptop, as others have said, I'm not an organization. There is an Enterprise policy .

Active Policy Name Policy Value ExtensionSettings {"firefoxhpsureclicksecurebrowsing@bromium.com":{"installation_mode":"blocked"},"firefoxhpwolfsecurityextension@bromium.com":{"install_url":"https://addons.bromium-online.com/wsx.xpi","installation_mode":"normal_installed"}}

I can't store or edit any bookmarks. How do I correct this? I need answers in very simple terms as I am very much a layman with computers. Thank You!

I am unable to log into RBS site on Firefox but I can on Chrome and Edge. What's the problem and how do I fix it? This has only happened in the last couple of days.

The title says it all. I use Firefox on my home computer with Windows 10, and my work laptop using Windows 11. At home, URLs do not autocomplete when typing them in--settings are all on for this to work properly, and it used to work properly, but it does not work at all. At work, URLs complete just fine.

Hello, My firefox app stoped working today(version for androids). I uninstalled it and installed it twice but it still won't work. When I open it, it stops working after a few seconds and I recive a notification that it crashed. What should I do?

I started getting this problem about 6 months ago. I have used Thunderbird on Linux for years with very few problems until about 6 months ago. What happens is that when I send a message I get a dialog box saying sending and it will hang there for a long time, sometimes permanently. The size of message doesnt matter. Sometimes I can click on cancel and then retry and I am sometimes told it was sent but not saved. Sometimes it did not get sent at all. It is getting more and more annoying. It seems to happen after long periods of inactivity. Its not DNS, I have changed settings and DNS servers make no difference. I even went through and deleted lots of email and still it persists. I am running no extensions.

i want to delete some site data to free up space since my firefox browser takes up 2.1GB of storage but i don't know which one takes up the most data and i don't want to delete data from ALL website.