bullets in navbar in firefox

I want to change the navigation.css, but I get different views from safari and firefox. Firefox keeps showing the bullets, that are similar to the navigation menu or other links that are places vertically. I put the primary links in the navbar-region, and also tried to add another menu up there, but it keeps showing the bullets for each item.

Does anyone have an idea to solve this, probably, simple, but nerve taking problem? Enclosed you find the screenshot.

Thanks in advance,
Drk