I've been looking for a way to do this for a while now and finally found it. I now officially never have to use Internet Explorer again.
This Firefox extension displays pagerank in the bottom right corner of your browser. As an added bonus, if you mouse over the PR display, it shows you the dmoz category (if any) that the current page is in. I've had it installed for about 10 minutes and already found it very useful.
http://www.tapouillo.com/firefox_extension/
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