WetGeek In the interest of full disclosure, one might point out that Vivaldi has also had this functionality (for a long time). Google is banned from my computers, so if the foreign text is being sent anywhere (which I doubt), it's not going to Google.
Seems like it's not quite the same as Firefox' new implementation as the data still gets send to Vivaldi's servers, but they at least claim it's encrypted and not readable to them.