But losses mount for the home furnishings e-retailer that went public in October.
Amway led both Internet Explorer and Firefox availability tests last month.
Amway.com had the best availability score for Internet Explorer testing among large retailers measured in July, says Compuware Gomez. Last month, the retailer posted 99.99% Internet Explorer availability.
HPShopping.com, HSN.com and Macys.com followed Internet Explorer tests with 99.98% availability. Dell.com was next at 99.97%.
In Firefox testing, Amway.com tied with three other retailers (HPShopping.com, Overstock.com, and Toysrus.com) at 100% availability for the month. HSN.com was next with a 99.99% availability rating.
The average Internet Explorer availability score among the 21 retailers measured in July was 99.49%. The same group of retailers produced an average Firefox score of 99.65%.
Click here to view the full test results.