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Chapter 14. Web Development with Firefox > JavaScript for Developers

JavaScript for Developers

Some tools and preferences are very helpful to developers. One such tool is the JavaScript console, which is installed with JavaScript. A number of JavaScript-related preferences (some of which exist in about:config and some of which must be added) improve the usability of JavaScript debugging tools.

JavaScript Console

The JavaScript Console is a window (separate from Firefox’s browser window) that displays error messages generated in JavaScript code. In Figure 14.5, you can see that the JavaScript Console started after opening Firefox and showed several errors in JavaScript code while running and a final error at shutdown.


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