tbtrayicon Files

Thunderbird tray icon add-on

A very simple web/mail extensions add-on for Thunderbird that
uses native messaging to display a persistent icon in the KDE systray.

Features
- New mail icon
- Optional unread count
- Selectable IMAP folders to watch


Installation

1st - Qt5 native binary
- install latest tbtrayicon_x.x.x_amd64.deb
- copy /usr/share/doc/tbtrayicon/tbtrayicon.json to your
  users directory ~/.mozilla/native-messaging-hosts/
- restart Thunderbird

2nd - Thunderbird add-on
- install latest tbtrayicon-x.x.x.xpi
- enable imap folders to scan
- if the icon is not visible in the KDE systray,
  adjust systray options to always display it


Remarks

There seems to be no web/mail extensions event to listen
for folder updates or incoming mails. This add-on just
rescans the enabled folders every few seconds.

You should not enable the icon with unread count option
for folders with many unread mails. This will noticeable
slow down Thunderbird.

After upgrading to Thunderbird 68 the add-on did not
work because of the 'query' function rising an error.
I had to delete and re-create the Thunderbird account
for my IMAP account.