html - firefox extension / javascript - how to access dynamically created element -

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i building firefox extension modify web page content.

it simple javascript finds html element , modifies it. script executed when button on toolbar pressed.

i want access element id="precont" content on web page created dynamically (it doesn't show when right click -> "view page source").

this returns null (after waiting page load , executing script):

var elem = document.getelementbyid("precont");

how gain access javascript?

   var elem = document.getelementbyid("precont");

returned null because web pages document object wasn't directly available in extension (chrome/button.js)

i gained access via current window:

  var precontelem = window.content.document.getelementbyid("precont");

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