Siderite's Bookmark Explorer by Firefox user 13188097

Move between bookmarks in a browser bookmark folder with ease, using keyboard shortcuts, context menus or buttons. The next site in the folder will be preloaded while you read the current one. Quickly bookmark HTML links directly in a Read Later folder, from which you can explore with the extension.

It offers bookmark management, delete, undelete, import/export links and many other features. It does not connect to any external servers, does not serve ads and it's completely free.

Instead of opening a million browser tabs and having everything be slow and low on resources, just bookmark all tabs in a folder, then read them one by one. Instead of having to open all pages you want to bookmark, just right click on links and add them to the Read Later folder. Makes reading the news or doing research comfortable and quick.