User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20051111 Firefox/1.5 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20051201 Thunderbird/1.5 The selected tab is always Calendars and is not possible to make Calendar the default active tab. Each time the application is restarted Calendats tab is the displayed tab even if before closing the application the selected tab is Calendar. This does not appen using the extension in Thunderbird 1.0.7 and in Sunbird 0.2 Reproducible: Always Steps to Reproduce: 1. Open Thunderbir 2. Open Calendar 3. The default tab is Calendars 4. Select and make active the Calendar tab (also somewhere named Date tab) 5. Exit Calendar 6. Exit Thunderbird 7. Restart Thunderbird 8. Restart Calendar 9. Active tab is already Calendars insted of Calendar Expected Results: I'm expecting that step 9 is: Active tab is Calendar and not Calendars

You're using a very old build. This was fixed months ago. *** This bug has been marked as a duplicate of 249552 ***