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I'm running Windows 10 and recently switched from the ESR Channel version (128.11.1) to the Release Channel version (139.0.2) and, since then, have started having a problem where the unread email count displayed on the system tray icon and also the count on the Taskbar icon are no longer correct. Most incoming, unread emails aren't counted. This feature has always worked correctly for me previously, ever since I first installed Thunderbird several years ago. When I go into Thunderbird, the count of unread emails in whatever folder they're in is still correct, the problem is just with the counts on the taskbar and tray icons.

I'm not 100% sure, but I *think* it might be the case that emails which end up in the default "Inbox" folder are added to the counts, but those which are automatically allocated on arrival to other folders on the basis of filter rules aren't being added to the counts displayed on the icons. I have searched for others reporting the same issue and haven't been able to find anything, so it seems unlikely that it's a bug. I'd greatly appreciate any help in resolving this issue please.

Hi everyone,

I'm on 140.0.2 / Win10

My current about:config:

browser.urlbar.trimHttps false browser.urlbar.trimURLs true browser.urlbar.untrimOnUserInteraction.featureGate false

I noticed the new https trimming, but when I double-click (e.g. to select a word in the URL) to copy or change a part, the https pops back, shifting where my cursor is relative to where it was, which is annoying for having to reposition the cursor.

Disabling `browser.urlbar.trimURLs` should make sense to revert to no-trimming, but it didn't work.

`browser.urlbar.untrimOnUserInteraction.featureGate` being false already shouldn't have caused the issue I described.

Many thanks in advance!

I suddenly can't see message body when opening Thunderbird. I only see a list of every email received but cannot read it in the opening window. I need to double click.

The release notes for Firefox version 140.0.1 indicate the extension button can can now be removed from the toolbar.the noes say:

"Firefox Extensions: Customize your toolbar with the option to remove the extensions shortcut, giving you more control over your browser. When the button is hidden, you can access the extensions panel again at any time from the Firefox menu by clicking the Extensions menu item."

I still cannot drag the button down and out of sight by customising the toolbar.

Suggestions welcome.

FF ver 140. just loaded and now all my sidebar bookmark fonts are black on black. How do I change the sidebar bookmark font back to white? When I disabled all Themes the white color came back, but enabling any theme and they the font turns black again.

Hi,

I have just started using Thunderbird and I'm trying to change the default colour for a hyperlink.

I have tried about:config -> browser.anchor_color and browser.active_color but neither has worked.

I also tried using a user.js file but that didn't work either.

I would have thought this would be a fairly basic thing but it seems to be impossible.

Hello community :)

hope everybody is doing well. I´m coming here with with asking for a help.

I´m managing browsers (Google Chrome, MS Edge and Firefox) in my company via GPOs. What we´ve been dealing with since 135 version came up is having the "Did Not Connect: Potential Security Issue error page , Error insufficient cert transparency" while visiting our internal resources.

Despite of having the security.pki.certificate_transparency.disable_for_spki_hashes set up -> main three certificate hashes are correctly added, basically copying the setup from Chromium browsers , where everything works as expected , Firefox is not.

The only way how to make it work is via security.pki.certificate_transparency.disable_for_hosts , which is , of course, not desirable , because of the security risks.

Does anyone face the same issues ?

Thank you very much ya´ll

when I click reply to an email the new message font size decreases (hard to read) and I can only type in the same size font as the original message and can find nowhere to increase font sizes etc

I am having some trouble getting Thunderbird to display all my messages. I tried troubleshooting mode and found that all the messages were displayed. Restarting in normal mode having disabled my extensions and hardware acceleration, the problem returned and I could not see most of my messages. So I need to make the other changes that troubleshooting mode makes. These are described at https://support.mozilla.org/en-US/kb/troubleshoot-mode-thunderbird as

• Window and sidebar size and position settings (described in terms of Firefox)
• userChrome and userContent customizations ; see userChrome.css and .js and userContent are unsupported

I do not understand what these are and how I can set them for routine use. Can someone point me to an explanation? Thanks.

As noted in my question something odd has appeared in my Thunderbird Email. Can someone help me get back to all English. I double checked my TB settings and it appears they are all set correctly.

Thanks, Brad

I've moved thunderbird between windows 10 computers several times without any issues in the past, but I'm having problems now.

My old PC is running windows 10 with the most up to date TB. New machine has windows 11.

In the past, it was just a case of installing TB on the new machine and replacing the profile folder there with the one from the old machine.

Now when I do this I get "your thunderbird profile could not be loaded. It may be missing or inaccessible"

Ay help with this woould be much appreciated

Hello,

I'm a bit out of ideas how I can get Firefox to display the correct characters. For reference: https://learnjapanese.moe/font/

Windows: I only have german and japanese locale installed, i even changed in intl.cpl the language to japanese. I have installed the japanese language pack / fonts and it's showing correctly in any windows editor.

Firefox: Second language set to japanese, disabled all addons, tried it on private mode to no success.

Any ideas how I get the characters to display?

Edit: I made it work by changing in about:config the font.cjk_pref_fallback_order-string to have ja as first.

Periodically I open Friefox and all my cookies have been deleted. I go into settings to find "Delete cookies and site data when Firefox is closed" has been checked (NOT BY ME!) again. This is very annoying as I then have to log into all my websites and go through 2FA. This is annoying to the point that I am posting on this site for help. Next step is find a new browser that doesn't screw up my work-flow randomly for no reason.

i'm an android phone user (A15) and i really don't like mobile website layouts, particularly when most websites fit elements to the screen aspect ratio instead of letting me pan around a more traditional 16:9 webpage. i've tried all sorts of user agent and javascript spoofing, but nothing really beats firefox's native "desktop site" toggle, but it sadly doesn't stay on across different tabs or sessions and i have to turn it on manually every time. it should be pretty simple to add this feature, and i'm sure that there's a lot of support for it too. thanks!

I would like to be able to click the little fire icon on an email in my "list of emails" window to Mark as Spam, then have Thunderbird automatically move it to my Bulk folder after that.

I looked to see if I could set up a filter to do that, but don't see "Marked as Spam" as one of the selection criteria.

Is there a setting to accomplish what I'm looking for?

I noticed on both Android 15 and 16 that the FF app shows 'Ask Bing' (see attachment) when you invoke the copy/select all/search etc. popup. .

I have not found a way to remove this. Any ideas?

Today (06/12/2025) upon opening a new tab, Firefox slid the new option of uploading a custom picture to apply to the background. Tried the new feature, now I can not find the setting that allows me to change the picture. I read the thread "Customize your wallpapers". The instructions are as follows; You can personalize your Firefox New Tab page by adding one of the available wallpapers. Follow these steps:

  1. In the right corner of the New Tab page, click the gear IG settings icon.
  2. In the customization panel, under the Wallpapers section, you will see different categories like Solid colors, Abstract and Photographs.

       Click the category you prefer. For example, selecting Abstract will show a variety of abstract designs. 

The problem I have is the customization panel is no where to be seen, I have click on EVERYTHING possible, it is not in my settings, why? How do find this?

Hello there,

I am using Thunderbird 128.11.1esr on macOS Ventura 13.7.6 (OCLP) and would like to have all my accounts displayed in one unified inbox:

https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/images/2025-06-16-23-42-32-0314df.png

In the past all my accounts relied on pop3, but now of them changed to imap only, which now shows up like this:

https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/images/2025-06-16-23-43-14-1d6721.png

Is there a way for me to have just one inbox folder? I set it up like this ages ago but can't recall which steps need to be taken to receive the desired view.

If I choose View > Folders > Unified folders I get this:

https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/images/2025-06-16-23-45-37-4f8cd1.png

Thanks in advance!