See if this helps; https://addons.mozilla.org/en-US/firefox/addon/%E7%BF%BB%E8%AF%91%E4%BE%A0-transl

See if this helps; https://addons.mozilla.org/en-US/firefox/addon/%E7%BF%BB%E8%AF%91%E4%BE%A0-translate-man/?src=search Translate Man by marchen Mouse pointer translation, selected translation, support any languages, google translate api, human interface, love it