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SeaMonkey for Mac

SeaMonkey 2.49.5

  -  49.84 MB  -  Open Source

Sometimes latest versions of the software can cause issues when installed on older devices or devices running an older version of the operating system.

Software makers usually fix these issues but it can take them some time. What you can do in the meantime is to download and install an older version of SeaMonkey 2.49.5.


For those interested in downloading the most recent release of SeaMonkey for Mac or reading our review, simply click here.


All old versions distributed on our website are completely virus-free and available for download at no cost.


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If you have any questions or ideas that you want to share with us - head over to our Contact page and let us know. We value your feedback!

  • SeaMonkey 2.49.5 Screenshots

    The images below have been resized. Click on them to view the screenshots in full size.

    SeaMonkey 2.49.5 Screenshot 1
  • SeaMonkey 2.49.5 Screenshot 2
  • SeaMonkey 2.49.5 Screenshot 3
  • SeaMonkey 2.49.5 Screenshot 4
  • SeaMonkey 2.49.5 Screenshot 5

What's new in this version:

- SeaMonkey 2.49.5 uses the same backend as Firefox and contains the relevant Firefox 52.9.0 ESR security fixes.
- SeaMonkey 2.49.5 shares most parts of the mail and news code with Thunderbird. Please read the Thunderbird 52.9.1 release notes for specific changes and security fixes in this release.
- Additional security fixes up to ESR 60.2 and a few enhancements have been backported.