I feel like I do pretty well at keeping my eyes open for things like this, but this site was new to me.
From the site:
"Greasemonkey is an add-on for the Firefox web browser, that allows you to run "scripts", or little programs that alter the web pages you view. See Installing Greasemonkey for more information."
the most valuable item on this list was the bulk photo uploader... this has been part of the reason why i don't list as often as i should, because it takes forever to load photos one at a time. I'm excited to check out all of my new features!