mozilla/butter — pull request #1381 by mjschranz (2012-11-19 16:43:41+00:00)
Title: [#2888] Class list shims were not added yet, causing the app to crash in...

... IE9 before even loading

https://webmademovies.lighthouseapp.com/projects/65733/tickets/2888-ie9-unable-to-get-value-of-the-property-add-object-is-null-or-undefined