Download Thunderbird 9.0 Beta 4

Thunderbird 9.0 Beta 4

Von Mozilla Organization  (Open Source)
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- Added an opt-in system for users to send performance data back to Mozilla to improve future versions of Thunderbird
- Better keyboard handling for attachments
- Windows users can hide the menu bar (and show it with the "alt" key)
- Several user interface fixes and improvements and \
- numerous other platform fixes