I think this is going in the wrong direction. While cool URIs don't change [0], many URLs that you'd like to bookmark are not cool. So for bookmarks to be useful long-term you need to store much more data than just the URL. At the very least you need a timestamp to be able to find the resource you wanted to bookmark on the Internet Archive in the future. But better would be to save a snapshot of the site alongside the bookmark instead. It's a shame that no browser cares to integrate that or other relatively simple usability enhancements instead of blindly copying Chrome's UI (which usually means removing features).
[0] https://www.w3.org/Provider/Style/URI