anchor.diff:      REPL.prototype.onEnterKey = function() {
           var text = this.getInput();
           if(text != "" && text !== undefined) {
  -            var previousCommands = JSON.parse(localStorage.getItem("previousCommands"));
  +            var previousCommands = JSON.parse(localStorage.getItem("better_errors_previous_commands"));
               this.previousCommandOffset = previousCommands.push(text);
               if(previousCommands.length > 100) {
                 previousCommands.splice(0, 1);
               }
  -            localStorage.setItem("previousCommands", JSON.stringify(previousCommands));
  +            localStorage.setItem("better_errors_previous_commands", JSON.stringify(previousCommands));
           }
           this.setInput("");
           this.sendInput(text);
  
positive.code:     function REPL(index) {
          this.index = index;
          
          var previousCommands = JSON.parse(localStorage.getItem("previousCommands"));
          if(previousCommands === null) {
            localStorage.setItem("previousCommands", JSON.stringify([]));
            previousCommands = [];
          }
  
  
negative.code:     
      REPL.prototype.onNavigateHistory = function(direction) {
          this.previousCommandOffset += direction;
          var previousCommands = JSON.parse(localStorage.getItem("better_errors_previous_commands"));
          
          if(this.previousCommandOffset < 0) {
              this.previousCommandOffset = -1;
  