Beta or prerelease software is not intended for inexperienced users, as the software may contain bugs or may potentially damage your system. We strongly recommend that users exercise caution and save all mission-critical data before installing or using this software.
Mozilla Thunderbird Beta is intended for developers and members of our testing community to use for evaluation and feedback. The beta version features Windows 7 Jump lists, fixes when importing email from Microsoft Outlook, and default mail client check now works with newer Linux distributions.
What's new in version 82.0b3
MailExtensions: API for running content scripts on displayed messages
MailExtensions: browser.tabs.sendMessage API added
Chat icons updated
MailExtensions: compose.begin functions now support creating a message with attachments
ReleaseOctober 19, 2020
Date AddedOctober 19, 2020
Operating SystemsWindows 10, Windows 8, Windows 8.1, Windows, Windows 7