The Firefox SEO quake extension saves you so much time and enables you to view the following within the need to click anything and it works in both FireFox Mozilla & INTERNET EXPLORER
(Which don’t have too many useful extensions so far):

1. Google PR - click to go to Google Toolbar Queries Page.
2. Google Indexed Pages - To google Site:current domain
3. Yahoo Link Domain - ToYahoo Site Explorer with linkdomain:current domain minus the results from the same domain - so you actually get only the links from out side of the current domain.
4. MSN Indexed Pages - Click to go to Live.com +domain: currentsite
5. Alexa Rank- Alexa Traffic Details Page
6. Age - Web Archive for the site
7. Delicious - History in del.icio.us
8. Internal Links - Internal SEO Quake Report
9. External Links - Internet SEO Quake Report

And gives you a 1 click option to view the following:

1. Whois - goes to Domain Tools
2. Page Source - Default View Source of FireFox / Internet Explorer
3. keyword density Report - which is very detailed and very clear.

Remember that the good old google toolbar is the only legit one for getting PageRank while browsing, some other may lead up to ip blacklist.