It gives you rich bookmarks with highlights, notes, tree-style web history, and collaboration.
I used to use macOS file metadata to also include the download location of the PDF to be able to go back to the source site, but found little use for that bit of file system metadata.
If it's a piece of article that I absolutely treasure, I use clean-mark[0]. It converts the page into markdown seamlessly, which I then send it as a PDF to my Kindle or read it on laptop.
2. Store in either "read" or "watch" Firefox bookmarks folder.
3. After consuming the content, if I think I might need the resource in the future, I store it in Static Marks [1], an open-source tool that I wrote.