WordPress is one such advanced blogging tool and it provides a rich set of features. Some add-ons for Firefox can help you with your installed version of WordPress. These are 10 Tools to Turn Firefox into WordPress’s Little Helper:
Screen grab to WordPress! - This addons ads to Screen Grab! by allowing screen captures to be uploaded to Wordpress (2.5+) blogs
One-Click Installer for WP - Install plugins or themes on your self-hosted WordPress blogs with a single click (needs the related WP plugin to work; not intended for Wordpress.com).
Wordpress.com Sidebar - Get quick access to your wordpress.com account from your browser sidebar.
MMD WordPress.com Extension - This extension adds a tiny statusbar panel that shows you your blog hit count for your WordPress.com blog.
Blog This in Windows Live Writer - Adds a button to Firefox which starts a new Windows Live Writer blog post prepopulated with content and title from the current web page. Blog the whole page, or just selected snippets.
WordPress Helper - The Firefox extension WordPress Helper helps you working with Wordpress by providing useful help and tools.
WordPress Post - This extension lets you post the text you select in your browser directly to your WordPress blog.
easyComment-a-Blog - Filling out Blog Comment Forms automatically with ease.
Deepest Sender - Deepest Sender is a client that will allow you to post to blogs from directly within Firefox. It is primarily a LiveJournal client, although it supports Blogger (GData) and WordPress (metaWeblog) too.
DashBlog - lets you quickly collect videos, images, text/quotes, songs and screen-captures from any web page and publish them to your blog (word press, blogger/blogspot, tumblr) and/or twitter.
Source: http://www.mitchelaneous.com/2008/12/19/10-tools-to-turn-firefox-into-wordpresss-little-helper/
With my appologies and all the credits only bellong to mitchelaneous.com