Hello! Thank you for your help! I want to install my personalized version of startpage as the common search engine on my android mobile. This is my personalized search string: https://www.startpage.com/do/mypage.pl?prfe=88c786572599bb1107d3c74eaec3b3ca5076330f9b0ee54884a22b7a784d2b0a689bbc9b7a89edd7438b53c487ee2e4e628759948e78c9e03a2a82c5107f459c595a56be6ab8c7def9ac63f6 But it is not possible! On the mozilla helppage it says (translated from german): https://support.mozilla.org/de/kb/suchmaschinen-verwalten-firefox-android#w_hinzufugen-einer-zusatzlichen-vordefinierten-suchmaschine "If the entered Internet address (URL) of the search string is invalid, an error message is displayed to help you enter a valid Internet address.''' Important: Make sure that you replace the search string with the placeholder "%s", for example:''' https://www.google.com/search?q=%s https://www.startpage.com/sp/search?q=%s https://search.brave.com/search?q=%s https://www.ecosia.org/search?q=%s But as you can see, in my personalized search string there is no placeholder! What to do to install nevertheless my personalized version of the startpage search string as the common search engine on my android mobile? Thank´s a lot Philip