[HKH2]

In Linux you can use xsel to grab the url and put it in a tagger using one shortcut, then add tags or comments.

As you can see, the harder part is using what you have tagged. If you have a custom menu that you do searches with, it can show matches, and if you keep a history of searches then more frequently used links can be seen first.

You can do all sorts of things with tag hierarchies and other stuff that a browser won't do, so tagging is often saner than thinking of how to make hierarchies using folders in a browser.