Updating page HTML causes endless loop

I'm writing a Firefox extension. The extension replaces certain words on the page with other words. Here's the basic code I'm using: function startup() { gBrowser.addEventListener("load", pageLoad, true); } function pageLoad(event) { if (event.originalTarget instanceof HTMLDocument) { var ht = content.document.body.innerHTML; ht = ht.replace(/\bthe\b/g,"el"); content.document.body.innerHTML = ht; } } The problem is that this code is causing an endless loop. When I set the innerHTML property of the body, it sends another load event, which causes the endless loop. How can I modify the page when it loads without causing the page load event to fire again?

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