Chrome: While there are more advanced ways to save stuff for later, bookmarks can still be helpful. SuperSorter removes one of the biggest pains of dealing with them: organisation.
The extension can automatically sort your bookmarks and (optionally) bookmarks bar alphabetically. It also groups folders together, remove duplicates, deletes empty folders and other general maintenance. You can even set it to automatically sort so that every time a new bookmark is added, it's put in its proper place immediately.