Save from any page

Drag one of these to your bookmarks bar. Clicking it on any page opens a small window that keeps it here.

Keep this page (home) ← drag me — never breaks

Keep this page (away) ← for use outside the house

Which one to use

Home points at http://192.168.0.60:5175. That address is fixed, so this one keeps working forever — but only on your own network.
Away points at https://antonio.tail4d9eaf.ts.net/abbookmarks. It works from anywhere, but this is a quick tunnel: the hostname changes every time cloudflared restarts, and when it does, come back to this page and drag a fresh copy. The home one is unaffected.

If dragging doesn't work

Create a bookmark by hand and paste this as the URL:

javascript:(function(){var u=encodeURIComponent(location.href),t=encodeURIComponent(document.title),s=encodeURIComponent((window.getSelection()||'').toString().slice(0,2000));window.open('http://192.168.0.60:5175/save?url='+u+'&title='+t+'&sel='+s,'abb','width=520,height=680');})();

…or, for the away version:

javascript:(function(){var u=encodeURIComponent(location.href),t=encodeURIComponent(document.title),s=encodeURIComponent((window.getSelection()||'').toString().slice(0,2000));window.open('https://antonio.tail4d9eaf.ts.net/abbookmarks/save?url='+u+'&title='+t+'&sel='+s,'abb','width=520,height=680');})();

Notes

It sends the page URL, its title, and any text you have selected.
Any text you had selected is kept as a quote in the bookmark's notes.
Opening a plain http:// window from an https:// page is not blocked — it is a navigation, not a subresource — so the home one works even on secure sites.