Put the PR bar on Mozilla & Firefox. I have using FireFox since version 0.6 (back when it was FireBird) for browser compatibility testing on my Inventory Listing Web Applicationfor Car Dealers. I am not sure what version that I started using Mozilla. While I like IE just fine I have all the major browsers installed on my system. I upgraded to FireFox 1.0 and Mozilla 1.7.3 today and install the mozdev.org Mozdev GoogleBar 0.8 and the NickStallman.net PRGoogleBar 2.0 on both browsers. Works great! If you don't have the green bar on your FireFox or Mozilla check these links out!
I have a PR bar in firefox, looks a lot like that, only it appears in the lower left of the window. Very nice!!
Here's another one. SearchStatus is a toolbar extension for both Mozilla & Mozilla Firefox. It shows Alexa Rank and PageRank. It places its self at the bottom right corner which I didn't like. Give it a try you might like it!
For those running some other than win32 Downloading FireFox and get Firefox, Modev GoogleBar and NickStallman.net PRGoogleBar for MacOS X, Solaris x86, Solaris SPARC, Linux, OS/2, BeOS & AIX. While FireFox's site doesn't list FreeBSD in the list, FireFox is in FreeBSD's ports installer so it should work on fbsd also.