Thunderbird 5 Beta 1 Released

Mozilla Labs has released the first beta of Thunderbird 5 (formerly Thunderbird 3.3) on June 2, 2011. To bypass extension compatibility checking in Thunderbird 5 Beta 1:

  • Tools Menu > Options…
  • Advanced Tab > In the Advanced Configuration section near the bottom click the Config Editor… button
  • Click the I’ll be careful, I promise! button
  • Right-click in the list and select New > Boolean
  • Enter extensions.checkCompatibility.5.0b and set to FALSE
  • Close the about:config Windows and click OK on the Options window
  • Close and restart Thunderbird and previously disabled add-ons should automatically be re-enabled. If not go to Tools Menu > Add-ons

The latest version of Thunderbird Beta has the following changes:

  • New Addons Manager and extension management API (user interface will be changed before final release)
  • Tabs can now be reordered and dragged to different windows
  • Revised account creation wizard, offering improved set-up
  • Attachment sizes now displayed along with attachments
  • and more…see Release Notes for full details

A quick reminder Thunderbird 4 has been skipped in an effort to keep the current Thunderbird numbering in-line with that of Firefox. Not sure yet when the final Thunderbird 5 will be released, but will likely be sometime around June 21st-28th.

Download Thunderbird 5.0 Beta 1

2 Comments on Thunderbird 5 Beta 1 Released

  1. Thanks for this!

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