toolbars/sliding-bookmarks-bar.css overlapping

[OskarCarl]

In the latest nightly the bookmarks bar overlaps the location bar when sliding up. I worked aroud it by scaling it in from the top instead of sliding it but it doesn't quite look as cool. I've attached a patch for this.
sliding-bookmarks-bar-patch.zip

[AFKoncore]

Guess I should bump this issue instead of making a new one(?)

Sliding Bookmarks bar, Firefox 62: the script works perfectly... except that it slides the URL/navigation bar instead of the bookmarks

[Admicos]

I'm using it with an additional

#nav-bar {
  z-index: 10;
}

rule and it works properly in 64.0a1 Nightly. Can you test it like this? If it works I'll try sending a PR.