Since moving to the thinkpad, I've been temporarily tagging things differently, so I can reassemble things into a consistent whole later. It's now (much) later. I think I'll also try to do some kind of "search through the HTML" trick to counteract the not-so-hidden numbers from Conkeror link-numbers.
I still want to grab the HTML of the selection instead, but I don't have time to add this to firefox myself - that starts moving in the direction of building my own browser and I really shouldn't go there :-)