You can easily check a website’s PageRank and Alexa rank in Firefox and Internet Explorer. Just install and use the Google Toolbar and Alexa Toolbar. In Firefox, if you do not like the Google Toolbar, you can use a nifty plugin called Searchstatus to do the job effectively – this is one of my favorite plugin for Firefox.
Unfortunately, up until now Google Chrome, still doesn’t support plugins. So, as much as I love Chrome, when I need to check a website’s PageRank and Alexa rank, I still need to switch to Firefox. Not very time saving of course.