כל המוצרים Community Forum

Wenn ich im Terminkalender einen Termin neu eintrage oder bearbeite erschnt ein Bearbeitungsfenster. Darin sind alle Eintragungen weiß auf schwarzem Hintergrund (OK).

Nur im Teilbereich "Beschreibung" erscheint seit einigen Wochen der Text schwarz auf schwarzem Hintergrund und ist daher nicht lesbar. Erst wenn dieser Text markiert wird, erscheint er gut lesbar weiß auf blauem Hintergrund.

Wie kann ich die Schriftfarbe hier wieder zu weiß auf schwarzem Hintergrund ändern?

Since yesterday , Thursday 29th October. Thunderbird has only been displaying the "Inbox" for my account, no emails are visible in it and all of the directories including the deleted emails directory and spam directory are absent. I have Windows 11 installed. I am using the IMAP server for incoming email and have checked that all the settings are correct. My account displays no incoming emails but can send emails. The directories are still absent when running Trouble shooter and the inbox is still empty. In the Account Settings - Server Settings I tested connection to the server and it said secure connection made - this worked for both outgoing and incoming servers. I have tried uninstalling and reinstalling Thunderbird but the issue persists. Although I do not change any settings the full set of directories will occasionally appear along with some emails and then seconds later disappear again. My email account is working fine on my phone and tablet using gmail.

Even though I am using Firefox on a Fedora based system, it should not change my startup page back to the Fedora project after every update, especially since I, the user has explicitly selected a different option in the settings after initial setup (Default Firefox homepage). I don't care about the new developments in Fedora enough to break my flow to look at it. This wouldn't be a big problem on a secondary browser, but Firefox is my main browser, I even have an account with which I am posting this, and in that case, changing the startup page to Fedora project after every update without my consent, even though it can be changed back to what I want, is a real problem.

• • Subject: Severe recurring UI freezes after upgrading Thunderbird from v114 to v150+ — application becomes unresponsive after being left idle**

Hello Thunderbird Support Team,

I'm experiencing a serious and persistent performance issue with Thunderbird that began immediately after upgrading from version 114 to version 150 in September 2026. The problem has continued through multiple subsequent updates and is now severely affecting my daily work.

I've been using Thunderbird for years, and it worked reliably before this major upgrade.

• • The problem**

Thunderbird launches normally and initially works perfectly. However, after I leave it open in the background while working in other applications, it frequently becomes completely unresponsive when I return to it.

Specifically: - Thunderbird is initially fast and responsive after launching. - After approximately 5–10 minutes, or sometimes after a longer period of inactivity, it begins experiencing severe lag or freezes completely. - When I switch back to Thunderbird, the interface is often unresponsive for several minutes. - I often have to force-close the application through Windows because it becomes practically unusable. - Restarting Thunderbird temporarily restores normal performance, but the problem eventually returns, when it's left idle. - The issue occurs repeatedly throughout the day and makes it very difficult to use Thunderbird reliably.

Importantly, this is not simply slow startup performance. Thunderbird initially works perfectly, and the freezing develops after it has been running for a while, particularly when left in the background.

• • Version and environment**

- Operating system: Windows 11 Pro, 64-bit - Thunderbird version before the upgrade: 114 - Version initially upgraded to: 150 - Subsequently confirmed version: 156.0.1 (64-bit), on September 29, 2026 - Problem first appeared: September 2026 - Problem still present: October 22, 2026 - Current Thunderbird version: 158.0.1

• • Troubleshooting already performed**

1. **Global search indexing:** I noticed that Thunderbird's Activity Manager frequently displayed "Indexing messages." I suspected that indexing might be causing the problem.

2. **Disabled Global Search and Indexer (Gloda):** Unfortunately, this made no meaningful difference. Thunderbird continued freezing even with global indexing disabled.

3. **Multiple Thunderbird updates:** The application has been updated repeatedly since the initial upgrade, but the freezing has persisted.

4. **Restarting Thunderbird:** Temporarily resolves the problem, but only until Thunderbird has been running for some time.

• • Additional unusual behavior: Google OAuth authentication**

On at least two occasions, after force-closing an unresponsive Thunderbird process, Google Chrome unexpectedly opened a Google authorization page saying:

"Mozilla Thunderbird Email wants access to your Google Account."

The page also indicated that Thunderbird already had some access to the Google account.

After clicking "Continue," Chrome redirected to a localhost address (127.0.0.1 equivalent, using a dynamically assigned port), which failed with:

"ERR_CONNECTION_REFUSED — localhost refused to connect."

I suspect this happens because Thunderbird is no longer running to receive the OAuth authorization callback.

I'm not sure whether the Google authorization issue is directly related to the freezes, but the repeated timing is suspicious and could indicate a background synchronization or authentication problem.

• • Impact**

I use Thunderbird extensively for professional correspondence and managing my translation business. These recurring freezes are seriously disrupting my workflow.

The problem has now persisted for over a month, despite updates and troubleshooting. It is becoming increasingly difficult to continue using Thunderbird in this condition.

• • What I would appreciate help investigating**

Could you please advise on how to identify the background process or operation that causes Thunderbird to become unresponsive after it has been running for several minutes?

In particular, I would appreciate guidance on:

- Whether this is a known regression affecting users who upgraded from much older Thunderbird versions. - Whether IMAP synchronization, background authentication, or Google OAuth activity could be responsible. - Whether there are diagnostic logs or performance profiles I can collect while Thunderbird is frozen. - Whether a particular database, profile component, or setting could be responsible without requiring me to rebuild my entire Thunderbird setup. - Whether there are known fixes or workarounds.

I'm happy to provide additional diagnostic information, screenshots, or logs if that would help identify the cause.

I would particularly appreciate a way to capture what Thunderbird is actually doing during these freezes, rather than continuing to try speculative troubleshooting steps.

Thank you in advance for your assistance!

Thanks for everyone who helped with my previous question,I forgot to say that my bad. Any ways like the title says,when i try to change my background image (homepage), it freezes. Help please.

I've been a long time user of Firefox, ever since Netscape tanked, but this recent issue is starting to anoy me. When ever I do a search directly on the adress bar using Google I receive a blank page with no results. Sometimes the Google homepage doesn't even open and when it does, the page just freezes after I press enter to do the search. I've tried clearing the cookies and cache and playing arround with the privacy settings, no sucess. I have no extentions or any kindd of costumization in the browser. If I open any page typing the correct adress or use one of the other search engines everything works fine. I've instaled and uninstaled Firefox many times, different versions and languages, also with not sucess. I even reinstaled windows...

What's wrong?

(I am a Chinese and English is not my native language, so please forgive my grammar or vocabulary errors) I was doing my programing test in class and the Tab Edit profile pop up, at the same time the theme of my browser changed. I didn`t want that changing so I clicked the Delete button. In the following few seconds nothing happened so I just put it aside and continued my examination (it was on a website and I need to sign in). And then suddenly, my browser was closed. When I opened it again, it didn`t recover any of my tabs. I tried to open my previous tabs and found that my history was empty, and when I returned to my examination and try to login, I found that even my passwords were all deleted. What was happened? how to recover my tabs and my passwords? I just don`t want to change my Theme why every thing was deleted? (and also, why Support service in Chinese is not available?)

I have several email accounts with 1&1 (Germany). Up until now, they have worked perfectly via Thunderbird. As of this morning, however, it no longer accepts any of my passwords. If I try logging in via the 1&1 webmail interface instead, everything works fine.

Hi there, I’ve spent many hours trying to find an answer. Perhaps it’s right under my nose, but I just can’t seem to find it. Please help!

I’ve created extra folders in Thunderbird to keep my messages organized. Question: How can I locate a specific folder?

Example: I create a folder named "a555". I CANNOT FIND THE FOLDER "a555".

(why did I choose "a555"? It’s a unique combination of letters and numbers, which ensures there are no unintended search results.)

Searching for a message does reveal the name of the folder it’s contained in, but that’s not what I’m looking for. I want to be able to search for the folder itself directly.

I have tried searching using: Global Search (top right) – Ctrl + K; Specific Search – Ctrl + Shift + F; This Thunderbird forum; A general search on the internet.

Any answer would be greatly appreciated. Arthur Cerew.

Love Thunderbird - thanks!

Can't seem to find what folder an email is in doing a search. The list of results doesn't show it and can't see it in the email. Maybe missing something. I sort emails by folders so not knowing the folder makes it hard to find what folder it is in (such as I may want to move that email).

Jim