I suggest utilizing the empty space at the very bottom of the vertical tabs sidebar to add useful widgets and shortcuts, similar to the layout in Zen Browser.
How it should work:
"Now Playing" Widget: A media indicator placed at the bottom of the sidebar, displaying currently playing audio/video with quick play/pause/skip controls.
Customizable Action Bar: A small dock at the very bottom where users can pin essential shortcut buttons for quick access (e.g., Downloads, History, Extensions, or Settings).
