Trying to update Firefox on my Galaxy A11 Model SM-A115A. I am on this phone right now, so it works for video, audio, cellphone, NETFLIX, Texting, Whatsapp, News, Weather. I initially downloaded & installed Firefox on this phone about 14 months ago. So, when going to Google Play, it says "You must be signed in to download ". But I am already signed into my Goog account. Then it says: Device not existing or, some crazy thing like that. In short, I am not allowed to update Firefox from Google Play. Are there other websites from which to download?? I suggest you start one, as Google Play can't keep its site clean from malware.