To toggle the new tab page off or back on, open a blank tab and then click the button in the upper-right corner of the page.
Read answer to: "Firefox Disable / Hide New Tab Page"
Firefox Disable / Hide New Tab Page 
Firefox: Add a Trusted CA
BASH Shell setup filename tab-completion case insensitive
Bash Shell: Convert Tabs To Spaces In a File
Linux / UNIX: List Open Files for Process
OpenBSD: Install Firefox Web Browser 
xargs: How To Control and Use Command Line Arguments
Howto: Linux command line utilities for removing blank lines from text files
Bash Find All File Names With White Spaces
AWK: Remove All Blank Spaces From String / Field 
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