FEBE (Firefox Environment Backup Extension) allows you to quickly and easily backup your Firefox extensions. In fact, it goes beyond just backing up -- It will actually rebuild your extensions individually into installable .xpi files.
Import/Export your Firefox extension preferences
Back to Top helps navigate long pages.
CLEO (Compact Library Extension Organizer) is a Firefox extension that works with FEBE* to package any number of extensions/themes into a single, installable .xpi file.
Paste email addresses, signatures and more into any textbox.
Paste your email address (or any other text) into text fields.
Go to top/bottom of current page by clicking (or right-clicking) the toolbar icon. Also includes these functions in the context menu.
Systematically enable/disable addons to find extension conflicts
Paste pre-defined text into any input field