Add a URL
Browser security prevents a page from silently rewriting itself on disk.
Use Export updated HTML, then save that file as your browser home/start page.
How to use
Paste a URL, optionally add a category and keywords, then click Add site.
Click a site title to open it. Click Copy URL to put the URL in the paste buffer.
Use Export JSON for backup. Use Export updated HTML when you want a new standalone page containing your current list.