Issue Editor Content Box (BB-993)

I utilize the site in Firefox; I've noticed instances where the content box on the 'Create new issue' page doesn't properly expand. What end up happening is I can't see what I'm typing. If I try to expand it manually, it snaps back when I start typing covering everything.

Additionally, the Properties (on the right) end up overlapping the content box. The content box itself is off set to the right and doesn't line up with things.