If you happen to try use the JavaScript property innerText on an element you wont get it work with FireFox browser.

The reason is FireFox does not have a property innerText, rather they use a property called textContent.

There are many ways to solve this problem.

Option 1:
Use JQuery.
Example:
$(document).ready(function() {
$(‘myElementId’).text(“My Text or Whatever”);
});

Option 2:
Create a JavaScript function, and call it when you need.

function ChangeContent(elem, content) {
if (document.all)
elem.innerText = content;
else
elem.textContent = content;
}

There are many other ways as well.
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From Webcosmo Webmaster Forum http://www.webcosmoforums.com/javascript-ajax/26917-innertext-does-not-work-firefox.html