rewrite urls in a firefox addon

Question

Hi, I'm writing a firefox addon, and if certain conditions are met, id like to rewrite the URL. Right now its being done in the following fashion

if(checkUrl(document.location.href))
{
    document.location.replace('xyz.com');
}

the problem with this is that the old page loads, then the condition is met, and only then is the user redirected.

Is there a way to do this before the page loads? i.e., once the user has typed in the url and hit enter (or clicked?)

Thanks!

Answer 1

If you place at the beginning of the body tag:

<script>
document.location.replace('xyz.com')
</script>

That should work.

Answer 2

for any future readers: https://developer.mozilla.org/en/Code_snippets/Progress_Listeners