I only bookmark references, not articles, and just use my browser's bookmarks. At most when for example planning a vacation or big purchase I'll make a folder and bookmark a bunch of relevant stuff, then delete the folder afterwards. If I see an article I want to read I'll just open it in another tab and read it. If I don't finish all my articles that day I can leave them open for a while, and then when I come back to it I often find that I don't actually care to read it as much as I thought, so I'll skim it or just close it unread