The folder pane shows a folder has received two messages, but the (2) is bold and white coloured.

If the (2) was bold and blue coloured then it would signify there are 2 new unread messages.

That tells me there are two unread messages; not two new unread messages.

If it was two new unread messages, then you also see a number in the Thunderbird icon as it would display number of new unread.

The folder pane shows a folder has received two messages, but the (2) is bold and white coloured. If the (2) was bold and blue coloured then it would signify there are 2 new unread messages. That tells me there are two unread messages; not two new unread messages. If it was two new unread messages, then you also see a number in the Thunderbird icon as it would display number of new unread.

Thank you for your reply. There are two questions: 1. I set a filter to move emails to different folders in thunderbird. Now I get 2 "new and unread" mails in a folder. The badge still not show new mails count. 2. I just want the badge show unread mails instead of "new" mails. Can I get that?

For someone search for the same solution： After checking the source code, I found： var countInboxesPref = "mail.notification.count.inbox_only"; var countNewMessagesPref = "mail.biff.use_new_count_in_badge";

set mail.notification.count.inbox_only to false set mail.biff.use_new_count_in_badge to false

Work like a charm.

For someone search for the same solution： After checking the source code, I found： var countInboxesPref = "mail.notification.count.inbox_only"; var countNewMessagesPref = "mail.biff.use_new_count_in_badge";

set mail.notification.count.inbox_only to false set mail.biff.use_new_count_in_badge to fa