[verified] Download Thunderbird 91.13.0 May 2026

While newer versions are available on the main Thunderbird site , older versions like 91.13.0 must be accessed through the official archives to ensure they are free from malware or unauthorized modifications.

Some specific older add-ons may perform better on this version than on more modern releases. System Requirements download thunderbird 91.13.0

Version 91.13.0 was the culmination of the 91.x development cycle, designed for maximum stability before the "Supernova" UI changes began in later versions. Key features include: While newer versions are available on the main

In the archive, navigate to the folder corresponding to your operating system (e.g., /win64/ for 64-bit Windows or /mac/ for macOS) and then choose your preferred language (e.g., /en-US/ ) to find the .exe or .dmg installer. Why Choose Version 91.13.0? Key features include: In the archive, navigate to

How to download older versions of Thunderbird - Mozilla Support