It should be possible to assign a shortcut-key for the built-in translator in Firefox for desktop. in the same way add an option to the contextual menu as happens in chrome or edge (and if God wants to give the possibility to sooner or later reduce that cumbersome contextual menu of elements that, at least for me, I have never used in my life)
obviously there shouldn't be two different buttons to translate and show the original page but only one that alternates between the translated page and the original one similar to the "TWP - translate web pages" extension