To automatically open the console when a JavaScript error occurs which of the following is added to prefs.js?

To open a dialog box each time an error occurs, which of the following is added to prefs.js?

Is it possible to nest functions in JavaScript?

Scripting language are

Which best explains getSelection()?

What is mean by "this" keyword in javascript?

In JavaScript, Window.prompt() method return true or false value ?

Which of the following function of Array object applies a function simultaneously against two values of the array (from right-to-left) as to reduce it to a single value?

Which of the following function of Array object returns the last (greatest) index of an element within the array equal to the specified value, or -1 if none is found?

Which of the following function of String object causes a string to be italic, as if it were in an <i> tag?