@mhoye I'd like to add that if you use DuckDuckGo as your default Firefox search provider you can extremely quickly search other search engines from the Quantumbar/omnibar/omnibox using bang commands. I use this feature constantly to search directly on sites like YouTube (!yt), AlternativeTo (!alt), and Amazon (!a). Other search engines may also have this feature.
@mish @mhoye I find #Duckduckgo bangs so useful. If I want to search the electronics distributor #Digikey, I just add !digikey. There are many bangs.