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JIRA server. Do the following:

1. Start Mozilla Thunderbird.

2. Select Add-ons from the "Hamburger Menu". (Or Press F10, then choose Tools - > Add-ons)
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   Select Add-ons

   .

   again:
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   The "Add-ons Manager" tab is displayed.
   

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3. Select Preferences.
   The "Thunderbird Integration for JIRA preferences" dialog is displayed.
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4. Enter the following information:

   • JIRA-URL: IP address or URL of your JIRA server 

     Info
     If your JIRA installation uses a special port you also need to specify the port number. Append the port number at the end of the URL separated by colon (e.g., https://jira.example.com:8080). Ask your JIRA administrator if you are not sure about URL and port number.

   • Username: Your user name on the JIRA server
   • Password: Your password on the JIRA server

5. 
   

   Warning
   Make sure to uninstall the Add-on, restart Thunderbird and close the Add-ons tab prior to reinstalling a new version of the add-on. It seems that some Javascript cache is not properly cleared otherwise

6. Select Add-ons from the "Hamburger Menu". (Or Press F10, then choose Tools - > Add-on Preferences → "Thunderbird® Integration for Jira®").
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   Select "Thunderbird® Integration for Jira®"
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   The Thunderbird Integration for Jira preferences Tab is displayed.

   Info
   As of Thunderbird 68 the preferences will appear as at tab instead a dialog window.

   
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   To test your connection settings, click Test connection.
   Information about your JIRA server and you user account should be displayed in the lower part of the dialog.
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The "Thunderbird Integration for JIRA Jira preferences" dialog provides the following tabs:

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