Rated 3 out of 5 stars
Unfortunately I was not able to get it working properly in TB 60 beta 7 (I installed this add-on for the first time). It was not so easy to sort out how to use it, the below comments helped a lot. My settings in about:config are:
But new folders don't have the specified columns in their default view.
Rated 5 out of 5 stars
I have written a review for the previous version: everything was fine except that there was no possibility to reorder the columns.
The new version fixed that issue, now it's just perfect!
Check my previous review for a way to change columns for *existing* IMAP folders using this add-on.
Rated 4 out of 5 stars
Does what it says - sets the default column layout for new folders.
There is no configuration UI, it is done by editing a comma-separated list variable in about:config. The name is mentioned in the addon's details, but it's not obvious. The process is a bit tricky since the columns are referred to by their code names, but a lot can be inferred from the names and their ordering. The starredCol column is not listed as default. The addon requires manual install from disk.