I do this too. Folders in the bookmarks toolbar. If I'm not done with a topic I just drag-and-drop these tabs into a folder. If you middle click one of these folders every bookmarks opens in a new tab for quick access.

And don't forget that you can add tags to your bookmarks to make them easier to find again.

You can hide the bookmark bar to save vertical space and then it's just a more organized, forgotten bookmark list. Using a search engine to find the page again is more likely for me than a bookmaker 😅 (if no tab).