Hiding blue accounts on TB with addon tinySmartFolderTreeMode by leoncastro

Hi, i had requested a script at greasyfork
a few years back & a dev. created an addon
he totally abandoned, & stopped replying.
It sadly stopped working on tb v74 & above…

It would be amazing if anyone could contribute
to turn it into a webextension available for Tb v78.*

http://s000.tinyupload.com/index.php?file_id=69623827314142373638