AutoMarkFolderRead v1.6

Fixed compatibility issue introduced with TB122.
This relase takes effect starting with TB version 122. All future releases must be developed for TB version 122 or higher.

Important:
If you are using Thunderbird until version 121 then use the latest v1.5.* release of the add-on.

For Thunderbird 122 and above use the add-on version 1.6 or later.