Exhibit 23.3
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of
our report dated February 28, 2008 relating to the financial statement, which appears in New Giant
Corporations Annual Report on Form 10-K for the year ended December 31, 2007.
/s/ PricewaterhouseCoopers LLP
Atlanta, GA
March 7, 2008