How to Know if JavaScript Is Deferrable
Deferrable JavaScript lets you load JavaScript objects asynchronously, so the JavaScript does not execute at the same time other elements, such as images and files, download. You must run Firebug on the browser to set up and view deferrable JavaScript. The option is disabled by default, but you can enable the setting in the browser's settings.
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Instructions
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Open the Web browser and click "Tools," then click "Firebug." Click "Open Firebug" from the list of options.
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Click the "Page Speed" tab. Click "Profile Deferrable JavaScript." The page opened in the browser is checked for JavaScript and performance.
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Click "Analyze Performance." If the JavaScript section is deferred, the report displays the lines and functions of JavaScript code that are deferred for the browser.
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