You can use below code if you want to add and remove classes in JS without jquery:

var select = document.getElementById("section").value;
	
if(select == 'popup'){
      document.getElementById("form").classList.add("montx_enabled");
	  document.getElementById("justforpoupvisiable").value = 1;
	  
		
	}else{
	    document.getElementById("poupvisiable").value = 0;
		document.getElementById("form").classList.remove("montx_enabled");
		
	}
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