“Thunderbird 126.96.36.199 provides stability and security enhancements that are part of our ongoing program to provide a safer email experience for our users. We recommend that all Thunderbird users upgrade to this latest version.
Here’s what’s new in Thunderbird 1.5:
- Improvements to product stability.
- Several security fixes.
The Rumbling Edge has a more detailed list of notable bug fixes.”
Mozilla via Juha