In this style sheet:

/wp-content/plugins/slick-sitemap//slickmap.css?ver=3.4.2

Edit this rule:

#primaryNav ol, ul {
 list-style: none;
}

To this:

#primaryNav ol, #primaryNav ul {
 list-style: none;
}

You can do this in the WordPress theme editor. If this is an error in the theme, you could report it to the author.

Edit: Actually, since it's part of a plugin, I'm not sure whether you can edit it through WP or need to download/edit/FTP it.

i edited the plugin css - through ftp - no change.

I deactivated the plugin, loaded a different one and all works fine now.

Thanks for pointing me in that direction!

For future reference, you often have to flush or bypass your browser cache when editing .css and .js files before Firefox will pick them up.

On Windows, you can use Ctrl+Shift+r to reload the page fresh from the server. You also can clear Firefox's cache completely using:

orange Firefox button or Tools menu > Options > Advanced

On the Network mini-tab > Cached Web Content : "Clear Now"

I had removed the browser history but not cleared the cache. I did, and it works. Awesome