Add option to have an empty tab group on firefox start up.

[zer09]

For example I have 3 tab group, "Research", "Social Networking", "Assorted". Then I want the "Assorted" tab to be a default tab when Firefox start, and all the site opened on the "Assorted" tab will be cleared when Firefox close. So giving you fresh empty work space when you start again.

This will also give you an option, that when you are researching on "Assorted" tab you can pick a tab to transfer to other groups and the other tabs that you didn't need can be discarded and cleared after Firefox closed or restart.

Thanks.