The solution given for setting Startpage as the default search engine on Firefox does not work on my newly purchased Samsung A21s mobile phone. I get a message telling me to "Replace query with "%s" and then gives a Google example... Also provides a More option which gives a string to use for Startpage: "https://startpage.com/sp/search?q=%s" but that also doesn't work, it just gives the same message "Replace query with "%s". My phone is using Android V11 and is model no SM-A217F. Any other suggestions to try?