I was creating a secondary navigation menu using embedded unordered lists with anchors and headers. Using a CSS reset sheet all headers and anchors are set
I tried both samples and experimented a bit myself.
The differentiating factor is strangely "list-style-position". Somehow in FF, "inside" and "outside" have "inline" and "block" effects for the bullets.
I can't tell you why, probably need to dig into the rendering engine.