This firefox extension has been built on top of this example https://github.com/mdn/webextensions-examples/tree/master/beastify

Product site: https://addons.mozilla.org/en-US/firefox/addon/session-manager/

Clicking a folder opens all the direct child bookmarks it has. If however the folder has no child bookmarks, the folder shows it's child folders.

Clicking a bookmark opens that bookmark in a new tab.

The "Open selected(s)" button opens all the selected bookmarks in a new window. Opens selected folders' direct child bookmarks.
The "Open recursively" button opens all the bookmarks in a new window per folder.
The "Delete item(s)" is an destructive operation. It will remove all the selected bookmarks and deletes all the folders recursively.

CICD can be implemented using the signing api https://addons-server.readthedocs.io/en/latest/topics/api/signing.html

https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/bookmarks/BookmarkTreeNode