first of all: thanks for the new version! I suppose Firefox is not the main target for moonstone, nor will it be used on LG Smart TVs (I think), but there are some regressions to moonstone on firefox. When reading the Developer Guide chaper "Tutorial: Building a Moonstone App", I tried to view the completed app on Firefox. The input box "Search Flickr" displayed its text twice: See this screenshot
There a several other issues with moonstone and firefox, e.g. the scrollbars in the Showcase App at "Moonstone UI" > "Accordion". So if have some spare time...