ShareThis + Comments Plus = Firefox8 fail

My epic struggle with Comments Plus continues.

Everything works if ShareThis is deactivated.

If I activate it then Facebook fails on Firefox8+. There is no popup to sign in. If I disable the javascript then all the browsers fail to open a Facebook signin popup. All the other services are fine.

I've tested this on three machines. ShareThis is used on 1,000,000 + websites so I think it's a fair one to hope for compatibility.

This is a showstopper for me :slight_frown:

Example link: Use Firefox 8+ and try to open the Facebook login popup:
test.toptasmania.com/2011/11/shortcode-test-2/comment-page-1/#