I need some help :(

Mar 28, 2018
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Hello everybody ! I have a problem , i have an Huawei p8 lite , 2 days ago i unnistaled my browser Chrome and i instaled Firefox . I thought is a better browser ...great. I tried to convert a song from youtube to mp3 from an website ....while i press download , 1 <<Edited by moderator.>> application downloaded....but after 3 minutes i deleted it.
An today my phone got <<edited>> ...i don't know if you can believe me , but the applications opens randomly , i have a password for every applications , and the phone press randomly on the numbers , even if i'm on the home screen he just keep opens the camera or whatever applications. I even went in the " Safe mode" and nothing happened...it's just keep opens applications and work 20% slowly...

I have to admit , i reseted the phone and my Card 2 times today ...and nothing :(

If somebody have an solution , please tell me.

I tried with some antiviruses and still nothing