A web clipper is a tool for saving web pages, selected text, or images as tiddlers. It's a key feature of information systems like Evernote and Onenote. Currently you can do this with the tiddlyclip extension and plugin (
http://tiddlyclip.tiddlyspot.com/) in firefox. It's unclear if this will work after coming changes in Firefox. It would be hard or impossible to have a built-in capture mechanism in TW because every browser is different, and are likely to require some 3rd party assistance. I've been using unmht to save web pages lately. You can use iframe to display MHT files in ff and then put keywords in your tiddler to help you find it.
What's <<snapshot>> ?
Mark