WordPress.com already has a very powerful browser extension for Chrome users. They have now launched one for Mozilla Firefox.

Features:

Notifications: You already have notifications on all WordPress.com powered blogs. This extension adds the same notifications box to your browser.

You can start following blogs even if they are not powered by WordPress.com platform. It detects the RSS feed and lets you follow them.

Press This feature lets you quickly share any webpage you are checking out on your WordPress.com blog.