Files
SingleFile
Keep a web article as one file you can read offline
BrowserFree browser extension · saves a page snapshot
Open SingleFile Why this one
A bookmark can disappear or change. Save the page you are reading into one HTML file when you need an offline reference or a record of what a public page said.
Try this first
Install the official extension, open a public article and let it finish loading. Save it with SingleFile, then reopen the HTML file offline to check that the text and images you need survived.