How do I get calculator & stock check etc. in google search alternatives?

I use Qwant now instead of Google search,

I miss just being able to type 23 * 3 + 210 * 2 into the search bar and getting a answer.

I also miss just typing tsla or 1 eur to usd and getting a answer, I use FireFox, are there plugins for this?
Or what would be a workaround?