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