Firefox also has a built-in "Web Developer Tools", having similar functions as Firebug plug-in. You can resume the execution via the continue button.
You can also use a full-scale IDE such as NetBeans or Eclipse, which provides content-assist auto-complete feature that greatly enhances your productivity.
Line 11 prompts the user for a number, and assigns it to the variable multiplier.
A variable is a named storage location that holds a value.
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