SupaSidebar 1.6.0 adds a Tab Switcher to try in Labs, Back and Forward in Compact Mode, and zoom and search in SupaView.

What's New

Tab Switcher (Labs) - Tap ⌃Tab in your browser to go back to your last tab, or hold ⌃ to pick from your 5 most recent.
Pick How the Tab Switcher Looks - Show recent tabs as cards like Arc, big pictures like ⌘Tab, or a simple list.
Back and Forward in Compact Mode - Compact Mode now has Back and Forward buttons under Search, with the same right-click history list.
Zoom in SupaView - ⌘+, ⌘- and ⌘0 now zoom SupaView pages like Chrome, and each site keeps its own zoom.
Search From the SupaView Title - Click a SupaView window's centered title or press ⌘L to search or type an address in that window.

Improvements

SupaView Stays on Its Desktop - SupaView windows now stay on the desktop they opened on, or turn on Show on All Desktops to have them follow you.
Easier to Move SupaView - Drag anywhere on a SupaView window's header, apart from its buttons, to move it.

Firefox, Firefox Nightly, Developer Edition and LibreWolf now show up in Link a Browser or Profile.
Hovering a folder now shows its preview while another app is in front, without clicking the sidebar first.