I've found something and thought it may be useful for others here.
Basically call the js script directly and place it in the actaual site /page itself you want to test instead of clicking the bookmarklet. It's alot less buggy too in the other browser modes than the bookmarklet allowed for.
<script src='http://getfirebug.com/releases/lite/1.2/firebug-lite-compressed.js'></script>