Rated 4 out of 5 stars

When I update to a newer version and I click on the Showcase on the right it appears a black overlay for thumbnails tab navigation

But I have installed the addon "Firefox Showcase" and in the past versions (, when I hit the Showcase button, it opens the Firefox Shocase box.
I've tried diffrent options or settings in Firefox but can't get it work.
So i guess it's a BUG?

Thanks for great work!