The following JavaScript code will let you add a PageRank bookmarklet in Firefox or Google Chrome browser by drag & drop. In Firefox, you can also associate a bookmark with keyword to access, for e.g. add this bookmarklet with the word “pr”, now when you visit a website, just enter “pr” in the address bar, hit return, and a new window pops up showing the PageRank of the URL.

javascript:void(window.open("http://www.chromefans.org/pr/?u="+escape(location.href), "PageRank%20Status%20-%20ChromeFans","width=405,height=120,top=0,left=0,location=0"))

Source:→ Google Blogoscoped