Too savvy to fall for tabnabbing? Me too. However, I don’t see the need for a browser tab to be refreshing while it’s not in focus. That behavior can be controlled by NoScript‘s forbidBGRefresh option in about:config. Take a look at v 188.8.131.52 and v 184.108.40.206 in the changelog.
0 – no blocking
1 – block refreshes on untrusted unfocused tabs
2 – block refreshes on trusted unfocused tabs
3 – block refreshes on both trusted and untrusted unfocused tab
NoScript’s default setting is 1. There’s also a preference for adding exceptions if you so desire–which for some reason is populated with mozilla.org by default.