alert(document.getElementsByClassName("level_green")[0].textContent);
This code is using global |document| which is XUL document of the Firebug
UI (not the page document)
Since there is no element with class "level_green" in Firebug UI it throws
an exception when trying to access the first returned element [0]
Try following:
initialize: function(context)
{
Firebug.Panel.initialize.apply(this, arguments);
alert(context.window.document.getElementsByClassName("level_green")[0].textContent);
}
Honza
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