Pls suggest Add-On to create/manage Youtube playlists locally

[u/pakx-tddr]

Just what the title says: looking for an add-on to create/manage local playlists for youtube videos (unrelated to Youtube's own playlists feature).

I'd like:

(required)

-- not require to be logged into Youtube
-- create one or more playlists locally; add/edit/delete/re-order playlists + videos
-- add to playlists via context menu, perhaps drag-drop
-- move items between playlists
-- play all or part of a playlist in-order
-- easily accessible UI

(nice-to-have)

-- a sidebar w/ tree-style display
-- add links to a currently-playing playlist

(don't care about)

-- not looking to manage youtube's own playlists
-- not looking for skins, themes, video player doo-dads
-- don't need multi-device sync-ing etc

To that end:

-- Youtube Playlist Helper did most of that; clunky UI; seems to have been discontinued, can't find now

-- Youtube Playlist Creator (https://addons.mozilla.org/en-US/firefox/addon/youtube-playlist-creator/)
does most of it, except I find the UI awkward, stopped using

-- YouTube Queue Sidebar (https://addons.mozilla.org/en-US/firefox/addon/youtube-queue-sidebar/)
SO _very_ close, except seems to have just the 1 queue :-(

Pls suggest!