Compacting folders progress bar

As I understand it, the progress bar now only shows for activities of significant length . But the activity of each individual "Compacting folder xxxx" is very short, so no progress bar.

What decides "long" vs "short"? It took at least 5 min, if not longer, to compact all folders in my 4 separate email accounts, especially after I deleted so many old messages. So how's a user supposed to know it's working vs frozen?

As I said, I think the compacting progress bar should be there...

I don't have more detail for you than what I have described about how it now works.

Compact hasn't changed for about a year now, and is not expected to change. So the typical total length of time should not change. And you can go about your business while compact is in progress.

Are you worried because you've had it freeze in recent months?

Thanks for helping...

Yes, TB has frozen several times in recent days. Just had 153.0.1 freeze today, 8-1-26. Previous time was with 153.0.0.7 on 7-28-26.

The PC does not freeze. I can open any other apps, eg Firefox, Task Manager, Office, etc, but TB is rock solid frozen. Ending all TB processes in Task Manager doesn't help. The only way to fix TB is to close all other open apps and do Win 11 Restart. Haven't had similar problems with any other software installed on this desktop PC.

Latest Event Viewer says: Log Name: Application Source: Application Hang Date: 8/1/2026 5:31:29 PM Event ID: 1002 Task Category: Hanging Events Level: Error Keywords: User: SYSTEM Computer: DESKTOP Description: The program thunderbird.exe version 153.0.1.0 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Security and Maintenance control panel.

Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">

 <System>
   <Provider Name="Application Hang" Guid="{c631c3dc-c676-59e4-2db3-5c0af00f9675}" />
   <EventID>1002</EventID>
   <Version>0</Version>
   <Level>2</Level>
   <Task>101</Task>
   <Opcode>0</Opcode>
   <Keywords>0x8000000000000000</Keywords>
   <TimeCreated SystemTime="2026-08-02T00:31:29.8111022Z" />
   <EventRecordID>34049</EventRecordID>
   <Correlation />
   <Execution ProcessID="13032" ThreadID="18776" />
   <Channel>Application</Channel>
   <Computer>DESKTOP</Computer>
   <Security UserID="S-1-5-18" />
 </System>
 <EventData>
   <Data Name="AppName">thunderbird.exe</Data>
   <Data Name="AppVersion">153.0.1.0</Data>
   <Data Name="ProcessId">0x3038</Data>
   <Data Name="StartTime">0x1dd2215ec7dd12d</Data>
   <Data Name="TerminationTime">60000</Data>
   <Data Name="ExeFileName">C:\Program Files\Mozilla Thunderbird\thunderbird.exe</Data>
   <Data Name="ReportId">18e657d6-7246-429e-8d89-bb9f6ba555e8</Data>
   <Data Name="PackageFullName">
   </Data>
   <Data Name="PackageRelativeAppId">
   </Data>
   <Data Name=HangType>Unknown</Data>

 </EventData>

</Event>

The previous time had same Event ID 1002 and same HangType>Unknown. I been using TB for years and don't remember having freezes like this previously, regardless of version installed...

It may be worth noting you've had problems in the past:

• https://support.mozilla.org/en-US/questions/1457949
• https://support.mozilla.org/en-US/questions/1460044