Request: Creation of a Tb addon: Hide account folders/icons

All i need is my inbox, drafts & trash, but i don’t want any accounts folders to appear in the “unified folders” view. & if i want to edit accounts, it’s still accessible in tools/Account settings, but i don’t want those useless “account name folders” to populate the folder pane

Ps: in “unified folders” view all my accounts needed folders appear under inbox & trash (dropdown menu), it’s all i need. & someone proposed to use favorites, mistakenly, favorites reinject those “account folders” icons…

It could be a userchrome.js code
or userstyle if possible…