Früher musste man die Wörterbuchsprache umschalten, heute geht das automatisch.
I've used Firefox quite some time, at least since 2009, likely longer. And I've liked the browser. It seemed to have better quality than competitors. When Chrome came out, I was tempted to switch. But I didn't want to let Google have all my data. It was sufficient that they had my address book and calendar, control over my phone and whatnot. My browing history was going to stay with me.