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If Thunderbird won’t open on your Mac and you see a message about Intel-based apps or Rosetta, this article will help you fix the problem.
“Support Ending for Intel-based Apps. This version of Thunderbird will not open in a future release of macOS.”
This usually means your version of Thunderbird is outdated or running using Rosetta.
Table of Contents
Why this happens
Apple is removing support for Rosetta, a tool that allows apps built for Intel-based Macs to run on Apple silicon devices (such as M1, M2, and newer). If Thunderbird is using Rosetta or is an older version:
- macOS may show a warning
- Thunderbird may stop opening entirely on newer macOS versions
Check if Thunderbird is using Rosetta
If your macOS version still supports Rosetta, you can turn it off:
- Quit Thunderbird.
- Open the folder.
- Find .
- Right-click (or Control-click) it and select .
- Look for .
- If checked, uncheck it.
- Close the window and open Thunderbird again.
If Thunderbird opens normally, the issue is fixed.
Update Thunderbird to the latest version
If you don’t see the Rosetta option, or Thunderbird still doesn’t open, update to the latest version.
- Visit the Thunderbird download page.
- Download the latest version of Thunderbird.
- Open the downloaded file.
- Drag Thunderbird into the folder.
- Replace the existing version if prompted.
- Open Thunderbird.
If you still see the message
- Make sure you are using the latest version of Thunderbird
- Restart your Mac after installing updates
- Check for macOS updates
If the problem continues, you can get help from Mozilla Support.
Frequently asked questions
What is Rosetta?
Rosetta is a compatibility feature from Apple that allows apps built for Intel-based Macs to run on newer Apple silicon devices (such as M1 and M2). To learn more, see this Apple support article.
Why is Rosetta being removed?
Apple is transitioning fully to Apple Silicon. Newer versions of macOS no longer support Rosetta, so apps must run natively.
Do I need Rosetta to use Thunderbird?
No. Current versions of Thunderbird are built to run natively on Apple silicon and do not require Rosetta.
What happens if I keep using an old version of Thunderbird?
Older versions that rely on Rosetta may stop working on newer versions of macOS. Updating Thunderbird ensures it continues to work properly.
Will updating Thunderbird affect my data?
No. Updating Thunderbird does not remove your bookmarks, history, or saved data.
