(In reply to Dão Gottwald [::dao] from comment #2)
(In reply to James Teh [:Jamie] from comment #0)
Clicking the icon currently does the same as Accel+K. Verdi is also considering letting the icon do nothing except for focusing the address bar. Either way it seems redundant to expose it as a button to accessibility software.
I understand the thinking here. It can be argued, though, that the button is no more redundant for keyboard users than it is visually. That is, as I understand it, this is about discoverability. Sure, you can press control+k, but maybe you don't know about that shortcut? In contrast, once you learn toolbar keyboard navigation (and yes, I know that isn't discoverable in itself, but it's one paradigm to learn instead of many), now this function is just as discoverable to a keyboard/screen reader user as it is to anyone else.
As you say, though, let's wait to see what the final UX spec is.