need more specific, either just few sentences or a whole page, as it'd be better without addon
but instead just have the two bookmark::
https://translate.google.com/?sl=auto&tl=en&op=translate
javascript:window.open("https://translate.google.com/?sl=auto&tl=en&text="+encodeURIComponent(document.location)+"&op=translate").focus()
each:
first is for into page of google language service
second for automation going to page of google language service immediately put URL being encoded in the entry field and in at the translation resukt, from which the user must click this at the translation resukt field