Thunderbird

Complete Guide to Thunderbird Turn Off Threads: Mac & Win

By Admin

Updated: March 31, 2026 ~ 4 Minutes Reading

Table of Contents

Threads are enabled in the Mozilla Thunderbird application by default, offering users a more compact view of the connected email messages.

However, users may often need to disable Thread in Thunderbird for better & confusion free email management or to avoid missing email replies.

Here we have listed the exact steps to turn off or on conversation view in all Thunderbird versions, including steps to expand and collapse Thunderbird messages on Mac, Windows, or Linux.

Thunderbird Threaded View: Meaning

Almost all Thunderbird versions support Threaded email view. Turning on/ enabling Thunderbird threads means grouping replied messages together for a more comprehensive view.

A Threaded conversion includes all messages in the same thread with the same subject line with a Re: prefix.

How a threaded conversation looks in Thunderbird

Thunderbird has no fixed limits on how many emails can be threaded under a conversation. This can cause issues like slow load, exceeding the mailbox size, and the thread not opening.

This can cause issues like slow loading, exceeding the mailbox size, and threads not opening.

Thus, there are various options to manage Thunderbird messages, such as the option to Turn Off Threads, collapse or expand threads, and even ignore threads.

Method 1: Thunderbird Turn Off Threads Using the View Tab

This method enables you to disable Thunderbird threads one folder at a time. Helpful in case you selectively want to thread or unthread conversions.

Note: Setting will not be automatically propagated to all new folders.

  1. Open Mozilla Thunderbird on your computer.
  2. Select the folder you want to unthread.
  3. Click on the View Tab from the Menu Bar.
  4. Select Sort By.
  5. Choose Unthreaded to disable Threaded Thunderbird view.
    steps to thread off a conversion in Thunderbird by View option

This changed how email messages are viewed in the inbox or any other folder. You need to repeat the steps for all the folders one at a time.

Method 2: Disable Thunderbird Thread for All Folders

If you want to turn off the threaded view of all existing folders at once and automatically apply the settings to all the newly created folders, the recommended steps are given below:

  1. In Thunderbird, click on Menu.
  2. Go to Settings.
  3. Go to the Appearances Tab.
  4. Scroll to Sorting and Threading.
  5. Select Unthreaded.
  6. Click on the All Existing Folder Option.
    Disable Thunderbird Thread for All Folders
  7. Press Ok to Confirm.

Tip: To selectively apply the settings on All Folders at a time, use the Choose Folder & Its Children option.

Method 3: Advanced Way Turn Off Thunderbird Threaded View

Often, time-applied settings do not work in Thunderbird. In such cases, you may need to change the deep-level system modification to turn off Threaded messages.

Note: These settings are applicable and functional to new folders created in Thunderbird not the pre-existing folders.

  1. Open Thunderbird >> Menu >> Settings.
  2. Search for Config Editor.
  3. Click on Show All.
  4. Press Ctrl+F on your keyboard.
  5. Search for: mailnews.default_view_flags.
  6. Click on Edit.
  7. Set the value to 0 to unthread, and if the value is set to 1, then the message will be threaded.
    Config editor settings of Thunderbird to disable Threads

Tip: After applying the settings to enable or disable Thunderbird threads, always rebuild the Thunderbird index and restart Thunderbird to avoid the Thunderbird search not working issue.

How to Collapse or Expand Threads in Thunderbird?

It is fairly easy to expand and collapse messages under an email thread in Thunderbird. There are multiple shortcuts and dedicated options available to do so.

  1. Select the Folder for which you want to collapse or expand threads.
  2. Click on View from the Menu Bar.
  3. Choose Threads.
  4. Select Expand or Collapse as required.
    collapse or expand thread option in Thunderbird

To expand or collapse a single Thread in Thunderbird, you can simply press the Reply icon or press * or T on your keyboard.

Additional Tip: Thunderbird data safety is crucial; use Thunderbird Backup Tool to back up your entire profile data with contacts, calendar, and complete data integrity.

FAQ: Thunderbird Turn Off Threads

Q1: What to do when Thunderbird threads are not working?

You have likely disabled Thunderbird threads in such a situation. Go to view >> sort by >> select Threaded to enable Thunderbird threads.

Q2: How do I ignore threads in Thunderbird?

The shortcut to ignore Thunderbird threads is to press K. You can also select the thread, right-click, and choose Ignore thread.

Q3: Is ungrouping emails the same as disabling the threads?

Yes, if you disable threads in Thunderbird, your emails will be ungrouped.