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In recent weeks, Thunderbird often hangs when I'm replying to another email and have written a sentence or two. It never recovers, and I have to close the program from Windows.

It doesn't always do this. On a few occasions, if I wait a while, close Thunderbird from Windows, and restart it, the partial is in the Drafts folder.

I'm running Windows 11 24H2, but I've been on 24H2 since December, and this problem is more recent.

My Thunderbird (version 115.12.2) is running on a Windows 11 system. My profile has multiple accounts configured as IMAP to multiple email services. I also have the Status Bar and Activity indicator enabled. Randomly, both indicators will show busy for an extended period of time. When I view this in the Activity Manager I see one or more folders hung for 10 or 20 minutes downloading one message out of several. This occurs in multiple accounts and servers.

I have researched this and attempted the fixes presented. I have cleared the cache files and compacted and rebuild email folders as suggested, but the slow update still occurs.

Then I decided to try and capture a ProMon.exe trace to see what is happening. What I found was Thunderbird.exe was spending all of the time while hung access the following file: C:\Users\MyUser\AppData\LocalLow\Intel\ ShaderCache\4a5eb0e65e559fc08e65ecb2fa9d650817ae895582a7a7ede162866d3e47a05a, like it was stuck in a loop.

When Thunderbird is operating normally, it is accessing this file but only for short period of times. Research says that it is ok to delete the files in this folder. I did that and it seemed to help for awhile. But it started happening again.

Does anyone have any idea what could be causing this? Is there a Windows thing to look further into? Any help would be greatly appreciated.

Is Firefox blocking my access to certain websites? for example www.rt.com I'm able to access using a VPN which suggests Firefox is restricting my access.

Thunderbird stopped receiving emails the day before. Now when I start Thunderbird I am being redirected to pinterest to sign in with username and password...not doing it. Hoping someone can help resolve this issue before I reformat my computer. Have not had this issue in the past and have been using Thunderbird for many many years, happened all of a sudden.

Recently purchased a new laptop. When I try to import contact list from old computer get message: import failed unexpectedly. more information may be available in error console. Need help please

I think I need to uninstall Firefox and reinstall it. Firefox has stoped working. If I try to login to an account on line, it just spins or does nothing. Can you help?

WebGL2 works fine for several hours but then packs up for no apparent reason. Closing all instances of Firefox browser (not just one tab), and restarting fixes it until the next time. This shouldn’t be necessary, and is becoming annoying as it is too late to save anything. Happens accessing express.co.uk and FlightRadar24.

How can I revert to the old layout of Firefox? In the new update the settings button and the tabs button swapped places and I don't like it as it doesn't make sense. I also want to have the settings button open the scroll down menu on the right instead of coming up from the bottom of the screen as it doesn't make sense to have that occur.

I'm trying to add Desmos Graphing Calculator to the bookmarks on the homepage. I have that setting turned on but Desmos doesn't appear even though I have it bookmarked. In fact, when I bookmark Desmos, it removes websites from appearing on the bookmarks homepage. I have a feeling it's because I hit "remove" on the bookmark on the homepage instead of hitting "delete" on the bookmark in the bookmarks folder, but then how do I undo that?

The system is not sening my e-mails out although it says they have been sent. This has only happened recently, perhaps following the most recent Thunderbird update. can you help?

Hi, mi machine runs Ubuntu Mate 24.04, kernel 6.14.0.29 and Firefox 141.0.3 . Starting from the end of last year, 2024, I get a strange situation: in Google Sheets I can invoke certain functions only in the range 5:00 am to midday, actually I never tried earlier. I asked for help to Google and we realized that the malfunction doesn't appear with Google Chrome browser or Brave. So I'm here to ask for support, how can I fix this?

Amazon (either UK or US) has suddenly stopped loading properly on Firefox - there's no main top menu or header, instead there's a text list down the LHS (see screenshots). This first happened yesterday (14 Sept 2025) and it's still the same today. It works OK on MS Edge, so it looks like the've changed something which Firefox no longer recognises.

I have enabled my Google calendar in Thunderbird. It seems to be displaying scheduled (as opposed to all-day) events twice in the calendar window. Why should this be?

There are several sites that do not display properly or have interface issues. These same sites work properly with Brave or Chronic.

One is insta card.co when trying to install a card to my phone. There is an overlay popup that should display instructions and links, but is blank on Firefox.

Another is the Google business site used to verify a business profile especially when taking a video to verify the business location. The video controls don't work; can't start video, zoom, or switch main to selfie camera.

Hi, Forums - I am a new Thunderbird user based on on-line research suggesting Thunderbird as the best way to relieve gmail account with local mailbox archiving. My gmail is out of storage by end of the month and my plan was to move a bunch of old messages into local Thunderbird mailbox to clear room in the google account. I have set up Thunderbird successfully with gmail using IMAP connectivity option. Thunderbird shows same folder structure as labels in gmail and displays all messages from the oldest to newest. So then I tried the "archiving" by setting up a folder structure under Thunderbird's Local Folders. Specifically, to start with I I set up Inbox_archive and Sent_archive and used right click Move To > Local Folders > Folder name to move old messages from live ...@gmail.com tree to Local Folder tree. Since there is also an option Copy To, my understanding was that Move should be different from Copy by also removing messages from gmail and move them to Local folders. At a first glance these steps seemed to work. I see unique old messages in Thuderbird Local Folders. I don't see these messages in Thunderbird's gmail inbox/sent and I also don't see these messages when I search in on-line gmail in:inbox and in:sent. I noticed, however, that google storage size didn't budge. I moved a thousand of more messages in the same way (thinking maybe older messages were just small) and the storage still didn't decrease. I then looked around in on-line gmail and found the messages that I presumed "archived" still sitting in gmail's All Mail. This explains why the storage size didn't change. I searched on the forum and on-line and can't get a confident answer on what am I missing to actually remove the messages from gmail - ideally in the most straightforward manner in one action as a cut and paste from on-line to local folders. Are there any SMTP settings that I should have so that Thunderbird's "Move to" actually removes messages from on-line account? Or is there a different archiving command/strategy I need to use?

I am hesitant to do any more trial and error on my own since I already messed up my gmail by having now thousands of messages still sitting in All Mail without proper Inbox and Sent tags and, thus, would appreciate the recommendation from someone who is familiar with my use case.

Thank you.