To add to lumitry's great answer, I'd like to suggest an alternative approach.
Vivaldi's "quick commands" are a separate feature. You open it by a hotkey, make your choice and it disappears.
One of its features is "switch to an open tab". In Chrome, this is built into omnibar:
My idea is that the best of both worlds would be - have it all available from Orion's address bar (or, shortly, OrionBar :-) ).
Right now, when I type something in OrionBar, the search scopes seem to include:
- top hits
- search engine suggestions
- bookmarks & history
By adding the following scopes, the OrionBar becomes quite powerful command palette (no separate interface required):
- open tabs (search by title & url), a suggestion would include "switch to this tab" badge;
- windows (search by name), a suggestion would include "switch to this window" badge;
- available browser commands (as with other scopes, frequently used commands become Top Hits).
Before:
After: