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Problem

When tagging emails, the lines usually get colored accordingly.

After deactivating all add-ons and adding one after the other again, it seems that activating the Thunderbird Integration for Jira add-on overrides the coloring.

All mails are shown in black.

Disabling the add-on again seemingly restores the coloring.

Solution

This behavior is not produced by the add-on.

The same behavior can also be re-produced by opening e.g. the Javascript Console, the Javascript Environment, Appointments or Reminders of the Lightning add-ons or other popup windows of other add-ons.

For all above cases it is irrelevant if the add-on Thunderbird Integration for Jira was installed or not respectively enabled or not.

This behavior is controlled by the decorator of the main window of Thunderbird itself. As soon as loosing the focus a CSS rule is activated that has the described effect. You can click on the Thunderbird main window at any time, even when having popups opened to focus it again.

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