Here is the list of 5 must use firefox addons for bloggers
ScribeFire is a full-featured blog editor that integrates with your browser and
lets you easily post to your blog. You can drag and drop formatted text from pages
you are browsing, take notes, upload images.
TwitterBar allows you to post to Twitter from Firefox’s address bar. A small
Twitter icon sits to the right of your address bar; clicking on it will post your
Adsense Notifier displays your Adsense earnings on the statusbar.
Instablogs Newsroom Submitter lets you submit anything on the web you think is newsworthy. Highlight the text on the page; click Instablogs icon on toolbar or right-click to access it from the pop-up menu and share your news with millions of people online.