firefox plugin wish: copy/paste extra

by Hugh

for any of my developer friends who have good connections with the firefox gods, here is what i would like to add to the plugin wishingwell (or maybe it exists already – pls send URLs):

copy/paste extra:

an enhancement of the copy/paste functions (ctrl-c/ctrl-v) that allows you to:
copy: to copy the text you want from a page *and* copy the URL of the page it comes from

paste: when you paste the text elsewhere (eg in the window of your blog editor), it pastes the text AND the URL underneath the text. Then linking to the URL will be much easier.

Could be tweaked in various ways, but I just want to avoid having to go back to the same tab twice, once to get the text, and a second time for the URL.

Maybe there’s already a way to do this – pls let me know.

UPDATE:
Kara suggests Jumpcut, a utility for macs that:

provides “clipboard buffering” — that is, access to text that you’ve cut or copied, even if you’ve subsequently cut or copied something else. The goal of Jumpcut’s interface is to provide quick, natural, intuitive access to your clipboard’s history.

And it works like a charm; will solve many little niggles I had beyond the original problem described above.