Hello, I am using the AdGuard App on all android devices. This blocks ads in all the apps on your device and also acts as a sort of systemwide firewall, DNS server and it blocks ads INSIDE other Apps. HOWEVER, From all known browsers on the same device ONLY FIREFOX will NOT work at all. It keeps saying "Website blocked - Insecure Connection" And you simply can't open any website, whatever change you make to the settings. The URL address line shows a crossed lock symbol, although "HTTPS enforcement" is OFF ONLY SOLUTION seems to be to Disable the Adguard App Protection completely or - possibly - indicate to the AdGuard App to add Firefox to a list of unmonitored Apps (like a whitelist for Android Apps)... Later on, you can add the normal browser addon of AdGuard or any other adblocker. STILL I'm asking myself why only Firefox behaves this way, when the AdGuard App wants to monitor the entire Firefox App?? The purpose of which honestly is to make sure any Android App is not leaking or sending data... QUESTION It would be safer to allow the Firefox App to be "audited" or monitored, since more and more SECURITY APPS are also keeping tabs on all the installed apps and monitor their behaviour. FYI ESET Android Security for example, explicitly states that Firefox is one of 3 browsers it CAN monitor. Hope you can communicate with the AdGuard App devs if there is a solution. or if this is an unlucky fluke due to the myriad of combinations of possible phones, Android Versions and personal setups... Thanks for the help or any commit later on for future releases. Have a nice day and hope this might intrest some people :-) Pascal