Shortcut to autofocus filter box when opening the popup

[maxxcrawford]

I cannot thank all of you enough for this container. It is the only way I browse the Web.

What @charles-m-knox writes:

One huge improvement that needs to be made to the multi-account containers UI: I use a container for each domain, sometimes multiple for the same domain. My list of containers is quite large. It would be extremely helpful to add a filter/search box to the multi-account containers dropdown box. It is quite difficult to scroll through a long list of containers, hoping I find the right one.

That is so me, too. I have a lot of containers. It'd be nice if I could just do Control+N, start typing the container I want, the list filters or smart-match selects or whatever, I hit Enter to open a tab in that container.

Originally posted by @hr-curtissimo in #1784 (comment)