It may depend on your selections in the Options Advanced Reading and
Display dialog. I have the Open messages in an existing window
radio button selected and uncheck the Close window on delete options.
That is my preference using Jamal's scripts. His scripts also require
the message
Ok, I have just tried thunderbird.
Bit early to say as yet but here are a few things I cannot get to work.
It wont read messages automatically, even when slected under verbosity.
Silence when deleting a message in the list, it does not
automatically read the next message in the list.