Firefox Community Forum

I have used Firefox for years, and especially since the ability to pin tabs was created. After this last update I experienced an issue on one website, which the tab is pinned, that was not present before. After putting things into my shopping cart, I click on the shopping cart and if the original tab is pinned then the shopping cart opens in a new tab. Before this latest update Firefox was smarter than that.

Is there a way to hide the top tab bar while I am using the Tree Style Tab option? I love the new option for using the Tree Style Tabs to my left, but it seems redundant to have the tabs on my left while also having them across the top. It clutters my window with too much text and I would love to see a cleaner window with just my bookmarks across the top and the tabs to my left. I can't seem to find a setting for that. Does one exist?