kill the app on Android 14

I used to kill the app with the help of built in command in Tasker in Android 13. What I have noticed is that after Android update to 14 this feature doesn't work as it is expected. Say I want to kill the Firefox running, and after I trigger the kill command I still observe Firefox running as nothing had happened to it. I also used the adb command am force-stop but the output was the same.