Some retailers launched online deals well in advance of Thanksgiving, Black Friday and Cyber Monday.
Williams-Sonoma.com was tops in Firefox web site availability tests.
JCPenney.com and Williams-Sonoma.com placed first among large retailers in April availability tests, says Compuware Gomez. Last month, online shoppers using Internet Explorer could access JCPenney.com 100% of the time. The site posted a 99.89% score in Firefox availability.
Williams-Sonoma.com averaged 99.98% availability in Firefox testing last month and 99.75% in Internet Explorer tests.
Six other retail sites (Amazon.com, LLBean.com, Newegg.com, OfficeMax.com, Target.com and Walmart.com) tied with the second-highest Internet Explorer availability score (99.98%).
OfficeMax.com came in second in Firefox testing at 99.96%. HSN.com (99.95%) came in third and was followed by Target.com (99.94%) and QVC.com (99.92%).
The average Internet Explorer availability for the 18 retailers measured in April was 99.88%, according to the Compuware Gomez Benchmarks study. The average Firefox availability for the same group of retailers was 99.63%.