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To print from the command line with Firefox, you need to install an extension. One such extension is
Command Line Print by torisugari.

This extension allows you to print URLs immediately, without user interaction. This can be useful to convert html pages to PDF for example.

You first have to install the extension from http://torisugari.googlepages.com/commandlineprint2

After you've properly installed the extension, you can start using Firefox as command line printer.

Usage:

$>firefox -print http://www.example.com/index.html

This tutorials shows how to restore all tabs that were open when you closed Firefox.

Go to about:config, this should be typed in the address bar.
Go to the section with that starts with browser.sessionstore and set the values to the whatever you like.

After a while every Firefox user notices that FF uses copious amounts of memory. Below are some tricks to remedy the large amounts of memory Firefox consumes.

While these tricks reduce the amount of memory that Firefox hogs, in general revisiting pages will be slower because Firefox caches less data.