'Moz Backup', and 'Mozilla - Firefox Accessibility Extension'

Moz Backup

MozBackup is a simple utility for creating backups of Mozilla Firefox, Mozilla Thunderbird, SeaMonkey, Mozilla Suite and Netscape profiles. It allows you to backup and restore bookmarks, mail, contacts, history, extensions, cache etc. It's easy way to do Firefox backup, Thunderbird backup.

http://mozbackup.jasnapaka.com/

Mozilla - Firefox Accessibility Extension

The Mozilla - Firefox Accessibility Extension makes it easier for people with disabilities to view and navigate web content. A toolbar provides easy access to navigation, styling, and keyboard enhancement functionality. Developers can use the extension to check their structural markup from the browser window to verify that it matches the page content. The Accessibility Extension helps authors to meet these kinds of accessibility practices that are so important for the browsing experience of all users and vital to those with special needs.

http://cita.disability.uiuc.edu/software/mozilla/