Assegnate 3 su 5 stelle

I inadvertently upgraded to Thunderbird 38.1.0 and LOST my Extra Folder Columns add-on. Comments and reviews are confusing: some say the function is built in, but following the directions does NOT WORK. Other reviews say "it doesn't work with TB38.1.0." Help me understand the reality! If built in please give instructions that work. If it isn't built in and a revised version of Extra Fiolder Columns add-on is requried, will there be an upgrade and an estimated date, or am I stuck with the less functional TB38.1.0!

Don Sherwood
DRSherw@attglobal.net