Steps to reproduce:
When on any normal web page, with a few browser tabs open, hit 'b'
A small sub-window should appear at the bottom of the browser window, with a list of my tabs, from which I can select a tab to change to.
Orion, OS version; hardware type:
MacBook Air (Retina, 13-inch, 2019)
Orion Version 0.99.112-beta (WebKit 614.1.1)
Tridactyl is a Firefox extension, very useful, gives vi-inspired keyboard shortcuts to browsing.
I'd be happy with either this extension, or else if Orion had emacs-inspired shortcuts that did the same things