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My Thunderbird inbox stopped accepting messages with a message 'Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox.' I 'repaired' the folder but all my junk messages suddenly reappeared in my inbox (a lot of them!). Tools didn;t work (wanted to re-apply junk filter). Went into safe mode - no difference. Now can't get any tools to work on the inbox folder. Not sure what to try next. Help much appreciated.

I have 2 hotmail accounts that Thunderbird can access but my wife's one has not since set up.

I have had to set up new email account for my wife because her one she has used for 10 years will end after 6th January 2026 because email service provider is ceasing email business. I have an hotmail address that has worked seamlessly with Thunderbird for 10 years. If it is tried in Thunderbird to access the new account to check for new mail it either states not authorised or not connected. I have tried adjusting settings to be same as mine but not succeed in solving. I am at a loss. Maybe it was easier set up accounts 10 years ago?

Hello,

I'm having a problem moving messages from one folder to another. There's one message which will not move no matter what I do. I'd like to turn off QuickFolders so that I can determine whether it causes the problem. How do I turn QuickFolders off, and then when I'm done with my experiment, turn it back on again?

I have Thunderbird 146.0.1 on a Win11 system, using POP. This setup has been in place from Windows 7, apart from the Thunderbird client version, and has worked up till the end of 2025. About October last year, I opened Thunderbird, and whenever I selected an email, or a number of emails, Thunderbird seems to get stuck trying to process something. The moving blue bar on the bottom right hand side of Thunderbird shows activity, but never stops. Taskmanager shows that Thunderbird is running, and that something is happening, but I cannot do anything with Thunderbird. I can only shutdown Thunderbird using Taskmanager. I have Norton AV installed, but I have turned it off, and the problem persists. I have removed all the emails from my inbox, and moved them to local files, and the problem persists. I have deleted and recreated my profile, and the problem persists. I have deleted the Thunderbird client and reinstalled it, and the problem persists. It doesn't matter if I select one, or twenty, emails, Thunderbird gets locked whilst processing something, and the problem persists. There is no issue with my Email provider, as I have checked using a webmail client. Emails are being processed and delivered from my email provider, and are received by Thunderbird. I would appreciate any suggestions as to the cause, or more importantly, a possible remedy. I have successfully used Thunderbird for many years, and I actively support them, so I am very keen to resolve this problem. Thank you in anticipation.

every time I enter some words for a search the system blocks access with an "I'm Not A Robot" process. while I always get past this it is annoying and has only started happening in the last few days.

Hi,

I use the Page Info window quite regularly, it used to be accessible via the right-click menu but this seems to have been removed in recent updates. I can still access it via Ctrl+I, but this isn't as convenient as using the menu.

Could you please tell me how I can put this useful feature onto the menu / toolbar as a shortcut?

Thanks

Owen.

For some strange reason, I get this response when logging in to local newspaper on Firefox..image one. When loading the same newspaper on Edge, I see this instead...image two. I've been in contact with the newspaper but the techs there can't figure what's happening. Is there a setting I have wrong on Firefox? Thanks for your time.

Error message says user name not owned by me, but it is! How do I fix that to use my additional email address? Why would email from two separate domains be linked, especially when I made no changes to the account info?

I've used Firefox for 20 years through the various iterations of Windows, and have been using it trouble free on Windows 11 since November 2024. Two days ago, however, When I tried to open the Guardian site (www.theguardian.com) it would open very slowly and not load and of the pictures. This gradually got worse, the site taking for ever to open at all, and always with the little dot in the tab at the top left going from side to side showing it was still loading. I have tried everything I can think of. Opened in troubleshoot mode, changed DNS settings, uninstalled and reinstalled Firefox twice (one time to see if it would work normally if I didn't actually sign in to my account). All to no avail. In fact now things are worse, in that the GOV.Uk website is now giving me similar problems - and a few other sites have become slightly slow and reluctant to open as well. My internet connection seems fine, and all these sites open without any trouble on Microsoft Edge. I am NOT very good at tech, and I am now tearing my heair out as to what I can try next.

Any help wopuld be gratefully received!

Jim Luetchford

Through extensive troubleshooting, I am unable to get firefox to open at all.

I've done a full uninstall, cleaned all user directories, program files / x86, program data, appdata roaming and local, etc. I used the Microsoft uninstaller and even Revo Uninstaller to remove everything related to Firefox, did a restart and reinstall of the latest one and it still won't launch.

Firefox was previously working until a reboot occurred and now it won't launch.

Firefox 32 bit seems to work when installed, and running Firefox as an admin previously worked but no it no longer does.

I looked at the following articles: - https://support.mozilla.org/en-US/kb/firefox-wont-start-find-solutions - https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles - https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles#w_start-the-profile-manager-when-firefox-is-closed

There's no malware on this machine (business EDR on it, even disabled it as a test and it still didn't open).

I was able to launch the profile manager but now I am unable to as the processes launch in task manager and then within 5 seconds they close.

Firefox is not running in the background for any user (I'm the only one logged in after a reboot as well)

I'm unable to open in troubleshoot mode either. Tried run as and admin cmd "C:\Program Files\Mozilla Firefox\firefox.exe" -safe-mode

Ran SFC / scannow / DISM restore health commands as well and both came back fine / no integrity violations

I sent a request for help and got this response:

"Well you might start by actually advising what the error is. We are at this point left to guess what "When launching Thunderbird, I get a pop-up saying Server "outlook.office365.com" reported en error" means and I can assure you it is not much to base a guess on. What is the message verbatim?"

You missed the point entirely! The point is that there NO ERROR CODE REPORTED, only the cryptic information I sent earlier. Further, if I knew the error code, I could fix it myself. The question is whether there is some kind of a log file kept in Thunderbird that may shed some light on the problem. Hopefully, now you understand the problem and can respond in a more meaningful and professional manner.

Some additional information: (a) sometimes email does not send, (b) I have already reinstalled T-Bird with with the mystery error continuing, (c) no errors were reported during installation. If there is no log file that T-Bird keeps and if you have no way of helping me track this down, T-Bird has ceased to be a practical alternative to Outlook.

My credit card payment methods are missing from Firefox's settings. I tried enabling every relevant setting in about:config and still they won't appear. My current relevant settings are shown in the attached screenshot. any suggestions?

I logged in to Thunderbird the other day and none of my stored folders were displayed. I logged in to my Virgin Media Email and they were all there. About 9 months ago I had a similar problem and it was resolved using my Thunderbird backup and help from yourselves. I cannot get this to work this time. Firstly I would be keen to know why the stored folders have suddenly not loaded when I start Thunderbird. Secondly is there an easy way to get the folders downloaded from Virgin Media rather than trying to use my backup? Thanks.

Somehow I have deleted the panel to the side of New Messages that I kept names of frequently emailed people. Now I have just a big page for a new message but no names. I have an address book with the names and email addresses but I have to look up anyone I want to send a message to. How do I get that panel backs to the New Message page?