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Hello All -

Over the years I have saved many bookmarks across several different devices. Therefore the bookmarks vary between devices. Is there any way that I can tidy up my bookmarks, deleting many of them, on my main machine and then have all the other devices Synch to that list only?

I have tried deleting ALL the bookmarks on the "subsidiary" devices and then synched them but that didn't work. I think I'm asking whether one device can be made the "master" for all the others to Synch to that one and none of the others.

Hope that's reasonably clear.

Thanks,

Ian.

Good morning, We are a company with around 10 employees and we use Thunderbird as our email client across multiple workstations. Some of our IMAP-configured mailboxes are used on several PCs and have grown quite large, causing local storage space issues.

I recently discovered that Thunderbird offers settings to manage synchronization more efficiently — for example, by limiting the download of messages to the last X days (e.g., 30 days), or by excluding certain folders from automatic synchronization. I’m referring specifically to the options under: Account Settings > Synchronization & Storage > Advanced…, and also the Disk Space section.

I tried changing these settings on an already configured account, but the changes don’t seem to take effect — messages are still being fully synchronized. I would like to know:

   If I’m doing something wrong in the process;

   If these changes only apply when configuring a new account;

   What is the recommended way to manage large IMAP mailboxes in a business environment to reduce local storage impact and improve performance.

Unfortunately, our email provider doesn’t offer alternative solutions unless we completely change the IMAP configuration, which we would prefer to avoid.

Thank you in advance for your support — I look forward to your response.

Best regards,

I did a new Windows 10 install yesterday. I then added my favourite apps.

When I got Firefox installed, adjusted the settings and added my extensions (most of which I've used for years), I found a glitch.

The icons for AdBlocker Ultimate and LastPass do not show up in the Customize Toolbar menu. I keep both of these on my toolbar in the past.

I've tried restarting Firefox several times and, finally, tried running it in Troubleshoot Mode. The last, it seems, doesn't allow the use of extension.

So ... please help!

Hi there, I had to migrate my emails because my email host migrated to office365. All seems to be working after a lot of time and stress but when sending emails the recipient sees this in front of my address: wp12103554-306076 How and where can I get this changed, to just show my name instead? I have looked everywhere under the settings but I can't get rid of the problem. Thanks!

Hi,

I have a very old 32bit computer with Windows 10 which has Thunderbird profile located in C:\Users\mbc0\AppData\Local\Mozilla Thunderbird

The new computer Windows 11 64bit has the profile stored in C:\Users\mbc0\AppData\Local\Thunderbird

The file structure also looks completely different, how do I move all my email/address books etc to the new installation please?

I have an extension I use on my Raspberry Pi media box which locks youtube videos to a selected resolution. On the Pi, this is very useful, as it wants to automatically change to lower resolutions when the resolution is set to "auto". However, on my desktop, this extension causes youtube to not respond to the spacebar properly (it requires two presses to change the pause state). These two browsers are both signed in to the same profile, so when I enable the extension for the Pi, it enables it on my desktop, and when I disable it on the desktop, it disables it on the Pi. Is there any way to have the extension enabled on one browser and disabled on another without using separate profiles? desktop: windows 10, firefox 142.0.1 Pi: raspbian, firefox 141.0

I can no longer do bulk deletions of selected emails. When I selected a group and press delete one only is removed. Same if I try to move to Trash or Deleted messages. i checked my version and it's up to date.

Hello everyone,

Like most of you, I'm aggressively attacked by advertising new tabs.

I'd like to have this: my tabs static, no movement, all fixed sizes, and no new tabs on redirects. If I need a new tab, I manually click the "+".-sign.

Fox tries to fit all tabs in, at the same time.

What I have tried so far is not working:

1. pinned tabs always get un-pinned at restart

2. pop-ups are stopped in Firefox own Settings

3. my settings in about:config: browser.uidensity = 0 browser.tabs.animate = false browser.tabs.tabmanager.enabled = false browser.tabs.allowTabDetach = false browser.tabs.tabMinWidth = 68 px dom.popup_allowed_events = False browser.tabs.loadInBackground = false services.sync.prefs.sync.browser.tabs.loadInBackground = false accessibility.blockautorefresh = false services.sync.prefs.sync.accessibility.blockautorefresh = false toolkit.tabbox.switchByScrolling = False browser.link.open_newwindow = 2 browser.link.open_newwindow.override.external = 3

Tabs still move, change size, and unwanted ones appear. :/

What settings should I change, add, or remove? Anyone more proficient than me, in about:config-programming?

Cheers!

I can't open Threads.com or Threads.net if the Facebook container extension is turned on. If I shut it off, Threads loads fine. If I'm already on Threads and turn on the extension is goes back to the Threads page with just the symbol and I can't use it. Can't sign in through Instagram or through history, either. Is there a work around for this?

Trying to load https://www.fire.ca.gov/incidents and it does NOT load completely, which it did before all of the upgrades... have to use chrome to view the site.

Since 9/10/25 late afternoon, Thunderbird is having problems retrieving my emails. I have two gmail accounts on T-Bird. Running BitDefender (turned off the email scanning). Even when BitDefender is turned off completely, T-Bird doesn't receive new emails.

In Account Settings, my default has a star. I can't select the Set as Default radio button, as it is greyed out, but can on my 2nd account (which is NOT my default). How do I fix this?

My settings:

Server Name: imap.gmail.com Port: 993 Security: SSL/TLS Auth Method: OAuth2 Outgoing Server: Google Mail - smtp.gmail.com

1. I am new to to using Thunderbird and have been using it for about 2 months. As of today I am using Ver. 142.

My replies to emails generates two copies in the "Sent" folder and in some cases, duplicate copies to the recipient. This duplication is inconvenient and embarrassing especially when replies are also duplicated to the recipient. The previous replies I have found to what appears to be a not uncommon question are some years old or apply to previous versions of Thunderbird where the software version, settings and options may have been different.

How can this duplication be prevented in 2025 and the latest version of the software?

2. Having not found any recent answers to the above question, I signed up to Mozilla/Thunderbird support. The registration process first declined the "Confirmation Code" and the window closed. (The code was copied and pasted therefore no error). In an effort to clarify whether the registration had been successful I attempted to log in via a new window - the email address and password were accepted.

However, the username (?) apparently a derivative of the email address used, appears in the top right corner of the Mozilla Support window: https://support.mozilla.org/en-US/questions/new/thunderbird/form) contained an unexpected additional digit.

Is the additional character necessary for some reason or is that another bug in the interface?

Thank you P W

Hello, Some 12-14 years ago my US based website manager signed me up with Thunderbird since he was having issues getting my Outlook to be compatible with his server. It had been relatively trouble free until recently.

When a recent update occured it appeared that Thunderbird had vaporized my e-mails from 2023/24. I had/have numerous e-mails related to a lawsuit that is tremendously important to me. I read on Mozilla's site about a program alled Recoverit from Wondershare. It did not appear to work at all. Not too long after my Lenovo PC died. The techa at Memory Express could only see a single program on my hard drive when I took the hard drive to them for analysis. I subsequently sent the drive to Secure Data

and they are sending it back to me.

In the meantime my replacement computer is an HP laptop. I purchased Windows 365 since they provided a technician to assist with setup. The tech could not get Thunderbird to work nor could they make Outlook work, MS blamed the server. The server guy says ir works, I have been without my e-mail for more than 6 weeks.

Can anyone help?

Seems unclear if possible at all rn, the browser asked me how I was enjoying it, I pressed the sad fox

and it sent me right here to put 'feedback' if this is the wrong place to give that feedback then maybe it's a bug.

I am using the Firefox browser on my iMac. Suddenly, I am not able to 'sign in' or access pages of common websites. I am getting blank pages or pages with the ever-circling ball when trying to access websites, like homedepot.com, shutterfly.com, etc. I can access them via safari.

I have gone through the Troubleshooting steps, have Uninstalled Firefox and Reinstalled, etc. What is happening with my browser?

I am on a MacBook Air using 142.0.1 (aarch64) and some websites like Amazon.com and Google News are displaying a mobile view, even though I am on desktop. A shift reload causes the desktop view to be displayed, but subsequent clicks lead to reverting to the mobile view.

Hello,

I have several PC;s but all suffer on occasion absurdly slow performance when a Firefox update is released.

I may be wrong but it appears there are too many of these processes running, I tried changing the value in " about:config " but Firefox defaults the value back to " 12 " when the browser is restarted.

" app.normandy.migrationsApplied 12 "

The below details are from a small, new cube pc that runs great, it is slow but does perform well, even previously just the other day running multiple Live Youtube streams with no issues, until now. :)

Any help would be great. Thank you!!!

" Firefox 142.0.1 (64-bit) "

Device Name Garage Processor Intel(R) Celeron(R) N4020 CPU @ 1.10GHz 1.10 GHz Installed RAM 4.00 GB (3.83 GB usable) Storage 58 GB SSD VID:32 MMC64G Graphics Card Intel(R) UHD Graphics 600 (128 MB) Device ID C12EB49A-0C22-41C3-A8E6-4420E4A419B0 Product ID 00330-50441-82637-AAOEM System Type 64-bit operating system, x64-based processor Pen and touch No pen or touch input is available for this display