RankQuest Add-on for Firefox
RankQuest is an interesting firefox Add On,especially if you are a web developer or a Webmaster. It blends with all the Web SEO tools such as various rank checkers(includes Alexa & Google Page Rank). Some exciting features like Site Ad optimization tool which prevents click fraud,which monitors every visit & tracks IP for every Ad click. Some more tools like Watch SEO, Watch RANK are also good. It also includes a Meta Tag Analyzer & Generator.It instantly shows up the Page Rank of the site which is being displayed in the tab.
Some Other features includes Link Popularity checker, alexa comparison,Keyword Density analyzer,Links Explorer Etc.
Download the Plugin here–> RankQuest.
A New FF & Avant Hybrid ! !
Yesterday i was having some loging issues with some forums .Neither of the optional browsers(I.E.& Opera) were of no use to log me in to the forums.So i asked my friend about any other option left apart from these. So he told me to google about Orca . I downloaded the beta( yes its still in beta stages)But it worked for me 
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This new browser named Orca is basically a hybrid version of Firefox3.0 & Avant browser. with all basic features that FF has got . It has got built in Adblock,flash blocker, spell checker , download manager, moreover the memory usage is negligible its pretty light on the system.
You can download the Beta from Their official site OrcaBrowser