Its a great plugin idea but it doesn't really work as intended. After setting up Zen, leaving idle for a day and returning back to to it, Zen erased by pinned tabs on click. I could click any pinned tab and it was like closing them. This behaviour was reproducible until I deactivated this plugin.

Configuration is arcane; settings aren't synced across browser sessions; 7/9 update broke the extension entirely. It works but needs work to shine.