how does it get favicons? it looks as if it's downloading them...

it would be nice if the search box was focused, so that one could hit a hotkey and start typing to find tabs

Edit: Thanks! That's great news.
Typing initiates filter does not work on Waterfox, but it does on Firefox 60, so I guess I am out of luck :(
Open Sidebar is the only action for which hotkeys work, both on Waterfox and Firefox 60

Edit2: Ideally this addon could be used entirely with the keyboard; shortcut to open pop-up menu, start to type to filter tabs, arrow keys to select tab, del to close tab, enter to open tab.
Unfortunately none of these features work.