To run javascript after the entire page is loaded

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Javascript

Hi all,

I have created an extension for firefox. But while checking I have confirmed that the Mozilla extension code is executing before the page load is complete. My javascript file cannot contain any html tags, so I cannot use method. Currently I am using window.addEventListener("load", function (e) { function.onLoad(e); }, false) method. But this method is executing the javascript before the page load is complete.I want to run my extension after page load is complete.

Can anyone suggest me a javascript function that I can invoke after the entire page has completed loading ?