mozilla/kuma — pull request #1329 by darkwing (2013-08-29 19:43:51+00:00)
Title: Various IE-specific CSS and JS updates

For old IE's (8 and lower), we:

1. Prevent the search/grow functionality
2. Fix last-child selector
3. Add a CSS mixin to note where a property/value is added just for old IE's so we can remove them in the future.