Firefox Add-ons

Add-ons extend Firefox, letting you personalize your browsing experience. Take a look around and make Firefox your own.

SeoQuake SEO extension >> Seoquake is a Mozilla Firefox SEO extension aimed primarily at helping web masters who deal with search engine optimization(SEO) and internet promotion of web sites. Seoquake allows to obtain and investigate many important SEO parameters of the internet.

Gmail Manager >> The original Gmail notifier for multiple accounts. Allows you to manage multiple Gmail accounts and receive new mail notifications. Displays your account details including unread messages, saved drafts, spam messages, labels with new mail, space used, and new mail snippets.

Source : https://addons.mozilla.org