For some time now I had a similar tab hoarding problem. My stop-gap solution is crammming a locally hosted markdown text editor in a new tab page. This way my bookmarks live as a Markdown file on my computer and I can easily add or remove links with as much additional comments as I like.

What I would like to add to it besides tons of polish is for it to be an extension that would also expose those bookmarks back to browser in form of bookmark folder syncing with the underlying markdown.