Full Fix: Mozilla Thunderbird issues on Windows 10/11, 7

by Milan Stanojevic
Milan Stanojevic
Milan Stanojevic
Windows & Software Expert
Milan has been enthusiastic about PCs ever since his childhood days, and this led him to take interest in all PC-related technologies. Before joining WindowsReport, he worked as... read more
Affiliate Disclosure
  • Even though using desktop email clients like Thunderbird comes with a number of benefits, sometimes they can run into issues.
  • In order to fix Thunderbird email problems as quickly as possible, make sure your email account is properly configured.
  • Check that the antivirus software you are using is not interfering with the system and blocking certain applications.
  • You can always use another email client suggested below that doesn't create problems for you.
fix mozilla thunderbird issues

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In one of our other articles, we mentioned that using desktop email clients has its benefits. Speaking of desktop email clients, one of the most popular email clients for Windows 10 is Thunderbird.

However, according to users, Thunderbird has its share of issues on Windows 10, and today we’re going to address some of these issues.

Thunderbird issues on Windows 10

Thunderbird issues can prevent you from receiving new emails, and speaking of Thunderbird, these are some common problems reported by users:

  • Mozilla Thunderbird problems sending emails – This issue can occur if your email account isn’t properly configured. To fix it, be sure that your login information is correct.
  • Mozilla Thunderbird very slow – Many users reported this issue, but we already covered this problem in-depth in our Thunderbird is a slow article, so be sure to check it out for more solutions.
  • Mozilla Thunderbird won’t download emails – This problem can sometimes occur due to your antivirus, and in order to fix the problem, you might have to disable or remove your antivirus software.
  • Mozilla Thunderbird keeps freezing, not responding, crashing, hanging – These are some various problems that can occur with Thunderbird, but you should be able to fix them using our solutions.
Tip icon
Quick Tip: Before starting any troubleshooting steps on Thunderbird, you should really think about avoiding this problem altogether and trying another e-mail client.
The solution recommended below is very popular thanks to its clean and friendly interface and, more importantly, it’s error-free.

Get Mailbird

1. Update Thunderbird

  1. Run Thunderbird.
  2. Go to the Help menu.
  3. Select About Thunderbird.
  4. Next, a Window will open and the software will automatically check for updates.
  5. When they are ready to install, select Restart Thunderbird to update.

Quite often issues with Thunderbird on Windows 10 can occur due to an outdated version of Thunderbird.

In order to fix most Thunderbird issues, it’s always good to use the latest version of Thunderbird on Windows 10 in order to avoid any potential incompatibility issues.

2. Run Thunderbird from Safe Mode

  1. Open the Settings app. You can do so using the Windows Key + I shortcut.
  2. Now go to the Update & Security section.
    Mozilla Thunderbird problems sending emails
  3. Select Recovery from the left pane. From the right pane choose Restart now.
    Mozilla Thunderbird problems sending emails
  4. A list of options will now appear.
  5. Navigate to Troubleshoot > Advanced options > Startup Settings.
  6. Click the Restart button.
  7. You should now see a list of options.
  8. Press the appropriate keyboard key to select the version of Safe Mode you want to use.

According to users, Thunderbird hangs on their Windows 10 PC while trying to perform a certain action, and this can be caused by any third-party application.

In order to fix this issue, some users are suggesting starting Thunderbird from Safe Mode. To do that follow these steps:

After entering the Safe Mode start Thunderbird. If Thunderbird is working normally in Safe Mode, the issue is most likely caused by a third-party application that is installed on your PC, and in order to fix Thunderbird, you’ll need to find the problematic application on your PC and disable/uninstall it.

3. Disable Thunderbird add-ons

  1. Press and hold Shift on your keyboard and run Thunderbird.
  2. You should see the Thunderbird Safe Mode window.
  3. Check Disable all add-ons and click Continue in Safe Mode.
  4. Optional: If the previous method isn’t working for you, you can always enter Safe Mode by starting Thunderbird normally and clicking the Menu icon in the top right, and choosing Help >Restart with Add-ons Disabled.

Sometimes issues with Thunderbird can be caused by third-party add-ons that you have installed.

The easiest way to check if a certain add-on is causing issues with Thunderbird is to start Thunderbird Safe Mode. To do that, do the following:

If you have resolved Thunderbird issues by entering the Safe Mode, then your issue is most likely caused by Thunderbird extensions, and in order to fix the issue you’ll have to disable/remove problematic extensions. To do that, follow these steps:

  1. Start Thunderbird.
  2. Click the Menu button in the top right corner and choose Add-ons.
  3. Now select the Extensions tab on the left.
  4. You should see a list of available extensions. Click Disable next to each extension in order to disable it.
  5. Now enable extensions one by one until you find the one that is causing you problems.

4. Reinstall Thunderbird

Sometimes Thunderbird issues can occur if your Thunderbird installation is corrupted. This can be fixed in most cases simply by reinstalling Thunderbird, so you might want to try that.

There are several ways to uninstall an application, and although removing Thunderbird from the Settings app is the simplest method, you should know that this method isn’t always effective.

Sometimes applications can leave certain files or registry entries behind, even after you uninstall them. This can be a problem since those files can cause issues in the future, so it’s advised to remove them.

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5. Make sure that your email account is properly configured

  1. Go to Tools > Account Settings.
  2. Alternatively, you can go to the Application menu button and choose Options > Account Settings.
  3. Select Server Settings from the left pane. In the right pane, make sure that your login information is correct.

One common Thunderbird issue is the inability to receive emails. This can happen for various reasons, but the most likely is misconfiguration of your email account in Thunderbird.

If this issue started occurring recently, the email configuration might be changed by your email provider, so be sure to check their support page and double-check if your email client is configured properly.

6. Rebuild Global Database

  1. Press Windows Key + R and enter %appdata% to open the run window.
    Mozilla Thunderbird very slow
  2. Now navigate to ThunderbirdProfiles.
    • Navigate to your Profile directory.
    • This directory should have a random string in front followed by your profile name.
  3. Now locate the global-messages-db.sqlite file and delete it.

If Thunderbird is slow while searching for emails, the problem might be your Global Database. This file stores all sorts of information, but if this file is corrupted, you might experience various Thunderbird issues.

However, you can fix the problem simply by rebuilding the Global Database. This is relatively simple to do, and you can do it by following these steps:

After doing that, start Thunderbird. The application will start building the database and the problem should be resolved.

7. Check your antivirus

According to users, Thunderbird issues can sometimes appear due to your antivirus.

Antivirus tools can sometimes interfere with your system and block certain applications, so to fix this problem, make sure that Thunderbird isn’t blocked by your antivirus or firewall.

If that doesn’t help, your next step would be to disable certain antivirus features, or even disable your antivirus altogether.

In some cases, you might even have to uninstall your antivirus. Even if you uninstall your antivirus, you should be protected by Windows Defender, so your PC won’t be at risk.

If removing the antivirus solves the problem, perhaps you should consider switching to a different antivirus solution with great protection that won’t interfere with other applications.

Thunderbird issues on Windows 10 are most often caused by a third-party application or by a Thunderbird extension, and you can easily fix most Thunderbird issues by following our solutions.

We also did a comparison between Thunderbird and OE Classic, so if you can’t fix problems with Thunderbird, you might want to switch to OE Classic.

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