Hey, bravo on the plugin. I spent the last 7 days testing every single sticky js on the web. Only a few actually work logically with proper overflow scrolling and stopping inside containers. One bug I see with every sticky js i've found is in Fire Fox. Maybe I have a CSS conflict, but even with this plugin, i'm still seeing the sidebar completely disappear when the fixed position activates in firefox.
I'm close to just giving up on the whole sticky idea, facebook seems to have the only script on the internet that actually works, but its not available to the public.
Here is a link to my test location: http://universalschema.nativeimaging.com
I'm using the newest jquery library from google ajax, and very close to the wordpress 2013 theme.
PS, i wish the position:sticky was finalized for CSS already. It's been 3 years in the waiting and its still a standard. GRRRR!!!
BTW, again, this plugin ROCKS!