637). Firebug is an extension of which browser?

[A]Mozilla
[B]Chrome
[C]IE
[D]Opera

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638). Firebug can be used to inspect ___________

[A]HTML
[B]CSS
[C]DOM
[D]All of the mentioned

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639). Why do Web Developers use Firebug?

[A]Track cookies
[B]Track sessions
[C]Both Track cookies and sessions
[D]Track data

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640). What are the goals for using Firebug?

[A]Performance
[B]Adaptability
[C]Complexity
[D]Reliability

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641). Which of the following is not a feature of the User Interface?

[A]Skinnable Interface
[B]Resizable Side Panel
[C]Fixed Side Panel
[D] Menu options

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642). What is the default value of the property overrideConsole?

[A]1
[B]true
[C]0
[D]False

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643). Which of the following property(s) has a default value as false?

[A]disableWhenFirebugActive
[B]showIconWhenHidden
[C]disableXHRListener
[D]both disableWhenFirebugActive & showIconWhenHidden

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644). Which of the following action is possible in Firebug when used as a JavaScript Debugger and Profiler?

[A]Pause execution in any line
[B]Find Scripts easily
[C] Find Scripts easily & also Pause execution in any line
[D]Find text easily

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645). What will be the output or type of error if p is not defined in the following JavaScript code?
console.log(p)

[A]Zero
[B]Null
[C]ReferenceError
[D]ValueNotFoundError

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646). The let keyword can be used ___________
console.log(p)

[A]in a for or for/in loop, as a substitute for var
[B]as a block statement, to define new variables
[C]to define variables that are scoped to a single expression
[D] all of the mentioned

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