I created html form for registration, where user must fill password input. Actually if \"register\" button is pressed, then i process form on the server side and i make redirect
Try setting autocomplete="off" on your input:
autocomplete="off"
<input type="password" name="password" autocomplete="off" />
https://developer.mozilla.org/en-US/docs/Mozilla/How_to_Turn_Off_Form_Autocompletion?redirectlocale=en-US&redirectslug=How_to_Turn_Off_Form_Autocompletion